tag:ezraharris.com,2013:/posts Ezra Speaks 2020-11-20T18:20:11Z Ezra Harris tag:ezraharris.com,2013:Post/1618677 2020-11-18T20:08:19Z 2020-11-20T18:20:11Z Sketch of Computer Storage Sizes

Imagine one dollar representing one byte of computer information. Use this example as a visual for the relative computer storage sizes:


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Harris Family
tag:ezraharris.com,2013:Post/1616088 2020-11-16T23:22:13Z 2020-11-17T22:12:05Z Raspberry Pi 400 Retro Keyboard

Raspberry pi recently announced its latest model of the Raspberry Pi. It's called the Raspberry Pi 400

It's not clear that it is available for purchase yet. I heard about it first from a podcast called SQPN that discusses technology. 

It is basically a Raspberry Pi put into a keyboard, so the Raspberry Pi 400 is the same as the Raspberry Pi 4 but with upgraded parts. It runs the latest version of Raspberry pi OS. The $100 kit includes the following:

  • Micro HDMI to HDMI cable (for monitor display)
  • Power cord 
  • Micro SD card (for the OS and storage)
  • Mouse
  • Raspberry Pi project book

It's also really cool because the ports on the keyboard are located in the back:

I will write a follow-up blog post when it arrives! 

Here's an example of a real retro keyboard with a built-in computer from the 1980s. It was called the Commodore 64. The Commodore had 64 Kb compared to the Raspberry Pi 400 that has 4GB of RAM. My Dad was in high school when the Commodore came out, and he remembers one classmate who had one, but no one else had one in his class. These movies came out the same year as the Commodore:

  • E.T.
  • Annie 
  • Star Trek Wrath of Khan 
Here are some old ads for the Commodore:

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tag:ezraharris.com,2013:Post/1604856 2020-10-19T22:13:29Z 2020-10-19T22:13:30Z Hoverboard?

Two Saturdays ago was "yard sale day," and my Mom, my little sister Sophie, and Johanna went garage sailing with my friend Adrian's family, and one of the things that Adrian got was a free hoverboard. I had assumed that this hoverboard was broken, so I asked if I could borrow it to try to fix it. And Adrian had agreed, so later that night, I began taking the hoverboard apart. I had checked the battery level with a power level indicator, and it had said that it was full, so I realized that the problem is between the power switch and the battery. And my brother Gideon found out the problem. It was that the power box cable wasn't plugged in. Once I plugged it in, the hoverboard turned on! I reassembled the hoverboard and took it outside, but it kept beeping with a red light when I turned it on. After a bit of googling, I found a video showing how to reset the hoverboard. I tried it, and it worked! I gave it back to Adrian the next day.

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Harris Family
tag:ezraharris.com,2013:Post/1602210 2020-10-09T16:01:05Z 2020-10-10T16:48:02Z Ender-3 Has Arrived

Yesterday the Creality Ender-3 arrived. In a post I did last week. I explained that I had ordered an Ender-3 off of eBay. It took about a week to arrive. I was excited to open the big box and start assembling. Assembling the printer was easier than I had expected, after a few bumps of assembling and taking apart I finished, and it took me about an hour to two hours. It came with sample white filament and a couple of simple 3d models, so I started a sample model of a dog and went to bed. The next morning, I took the dog off the print board, and I was surprised it printed quite well. The top of the dog's head messed up a bit, but that was because the filament sample roll had become loose at the end. I can't wait to start printing! Here are some pictures of the new printer next to the old printer: 

(New printer on the right)
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tag:ezraharris.com,2013:Post/1599165 2020-10-01T16:35:29Z 2020-10-01T16:35:30Z Using an iPod Touch as a OctoCam?

On my last blog post, just as I was about finished, I found a link to my old blog post called "PrintrBot," I noticed that in that blog post, I had taken a time-lapse video of a print. It looked better quality then the Octoprint camera I have now, so I thought it would look better if I could use my old iPod touch for the Octoprint camera. I did some googling and found a forum asking the same question, and the answer was yes! You could use an iPod or iPhone as a camera for Octoprint. So I followed the steps. The first step I did was go onto the App Store on the iPod and found an IP webcam app and downloaded it. Once that was done, I opened the app. It showed the IP address I needed to go to to view the live stream. And then I hopped back onto my computer and typed in the address. It had worked. It showed the camera feed from the iPod. So far, so good, then I went to Octoprint and installed a plugin called multi-cam, a plugin for monitoring separate cameras and quickly adding webcams to Octoprint. Once that was done, I added a new camera and typed in the IP address, but it did not load. The reason was (which I found out a few frustrating hours later) because the IP had linked to a place where it had settings and other stuff but what Octoprint wanted was the Video stream direct IP instead of a site with a ton of controls. The way I got the direct address to the video stream was by right-clicking the video feed and then clicking "Copy Image Address." and pasting that address into the stream URL on the multi-cam control panel, and it worked now I can use both cameras. Here is a picture of the control panel with the iPod video stream on:

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tag:ezraharris.com,2013:Post/1598481 2020-09-29T22:00:03Z 2020-09-30T21:38:32Z New Ender 3

Today I ordered an Ender-3 3D printer off of eBay. My brother Nicholas (who let me borrow his Ender-3 and his PrintrBot back in march) is going to take the printer back, and so he helped me find another one on eBay, Me and Nicholas found an ender-3 on eBay for about $200 by a trusted seller (), and I purchased it. I can't wait for it to arrive! Once it comes I will have to assemble it, so I have watched a couple of tutorial videos on building an ender-3. Here is probably my favorite one that found: https://youtu.be/me8Qrwh907Q

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tag:ezraharris.com,2013:Post/1596739 2020-09-23T21:44:09Z 2020-09-28T21:44:25Z Krunker Map Editor

There is an online multiplayer shooter game called Krunker. I have been playing Krunker since November last year. Krunker is a first-person shooter game that has the appearance of Minecraft because of the blocky characters and some of the game maps. And what I like the most about the game is that the community can post maps (like arena's, infection tag maps, etc.). The way you can create and publish a map is pretty easy. The first thing is to go to their online map editor. And there are objects you can make like cylinders, cubes, ramps, etc. With that, you can create some cool maps that other players can play. And there are also clans in the game that you can get invited to if you make good maps. The game modes for maps vary from "Free for all" to "Infection tag." I started making maps earlier this year. One that I have created is called: "TradeJail," it is a Prison themed map that is dedicated for the game-mode "Trade" where players can trade their weapon skins for other players' skins. Here is a picture of the editor: 

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tag:ezraharris.com,2013:Post/1594744 2020-09-17T00:17:22Z 2020-09-18T20:46:42Z Octoprint Apps

Today I decided to check out the different Octoprint 3rd-party client apps on the Apple app store. The first one I tried was called:

Kraken

Kraken was not that bad actually, but one problem I noticed was that when you pressed the movement controls, you would have to push them twice for it to respond.

OctoPod:

One thing I noticed with this app is that it was compatible with Siri, which meant I could tell Siri to start printing something on my printer file list. I also really liked the colors and the layout of the app; it felt very clean. 

OctoShell:

This one did not work. And it felt like an old layout, the font was older. And there were no options or any customization.

3DPC "Your Printer's Companion App."

I like this one actually because it felt like I was in more control of my printer. And most of the controls were on the same page, and there were many customizable settings.

OctoClient lite

This one I did not like so much because most of the tools did not work unless you paid for the pro version.

Summary

Most of the apps had a pro version where you could pay to unlock features. But I think I will stick to using the web instead, if I had to choose an app out of all of them I would choose 3DPC because of how much control I have on that app. This is a picture of OctoPrint on the web: 

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tag:ezraharris.com,2013:Post/1590527 2020-09-03T23:39:26Z 2020-09-04T21:42:26Z Octolapse

A couple of days ago, I found out about a plugin for Octoprint (Don't know what Octoprint is? Click here for more information.) It is called Octolapse. Octolapse is used for taking a ton of photos after each layer and putting them together to make a video that looks like a timelapse, and the result is quite cool. I found out about Octolapse because of a Youtube channel that posts a ton of timelapse videos (WildRoseBuild's channel). So I decided to try the plugin. I installed it but as I was hitting the print button on Octoprint's control panel I got an error message from Octolapse saying I needed to put in some print settings that I have for the printer. And so I opened Cura and entered in the correct settings, then I hit start printing. What is pretty cool is that you can view the timelapse preview as the camera is taking a picture. Here is the result of my first Octolapse: 

And here is a screenshot of the Octolapse control panel: 
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tag:ezraharris.com,2013:Post/1573285 2020-07-14T17:37:43Z 2020-07-14T18:48:04Z TinkerCad

Recently I found an online 3d modeling program called TinkerCad. I found Tinkercad through fusion 360 (which my brother Gideon uses), which is a more complex 3D design program by Autodesk. TinkerCad is fun because it is super simple, but it's also different from most other programs. For example, you can use one shape to cut into another shape to form whatever you want. But most other programs are different because you merge together objects instead of cutting and slicing at an object. Some schools also use Tinkercad because you can create Tinkercad classrooms. I haven't been to a Tinkercad class before, but that would be interesting to try out. Tinkercad also has an app on the app store for iPad, on the iPad, you can use AR (Don't know what AR is? Click here for more info about a similar AR app) to see you 3D objects placed down on tables, chairs, etc. (my Tinkercad profile

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tag:ezraharris.com,2013:Post/1570748 2020-07-08T17:11:47Z 2020-07-09T16:16:14Z 3D Printing Wood?

Yesterday I was looking at a list of 3D filament types. Here is a list of 16 different types of filament: 

(Please note: not all of these filament types work for my printer, and that there are more types of filament than listed below)

  1. ABS Filament 
  2. PLA Filament 
  3. PET Filament 
  4. PETT Filament 
  5. Nylon Filament 
  6. PVA Filament 
  7. Sandstone Filament 
  8. Wood Filament 
  9. Metal Filament 
  10. HIPS Filament 
  11. Magnetic Iron Filament 
  12. Conductive Filament 
  13. Carbon Fiber Filament 
  14. TPE Filament 
  15. Glow in the Dark Filament
  16. Amphora Filament 

I didn't realize that you could print wood filament. That sounded interesting to me, so I looked it up on Amazon. I read some of the reviews. Apparently, when you are 3D printing wood filament, it actually smells like wood, which is surprising because the filament is created out of such small recycled wood bits. It is mainly made out of PLA with which I have already been printing. But there is a difference from printing pure PLA versus printing with the wood filament. People say you have to use a bigger nozzle to print wood because it might clog up (don't know what a nozzle is? Click here for more info). But I did find a youtube video by CHEP that explained how you could avoid having to install a different nozzle when using Wood filament: 


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Harris Family
tag:ezraharris.com,2013:Post/1556268 2020-06-10T16:53:35Z 2020-09-28T21:44:14Z 3D Printing Upgrades

A while back I was looking at upgrades that I could 3D print for my ender-3 printer. I had found a couple of youtube videos on that but this one is the one I liked most: 

 

1. The first upgrade I printed was a fan cover for one of the fans, it took about five hours to print! Which I had not expected to take that long, but when it finished it fit perfectly on, here is a picture I took: 

2. The next upgrade I printed was a cable clip, the cables on the 3D printer were getting messy and I saw this cable upgrade so I printed it. Actually, before I printed that cable clip design I had printed a different design I saw on Thingiverse, but when it had finished printing I tried to clip it on but It was too big for the Ender-3 rail. That was when I found a different one on Thingiverse that fit the ender-3 rail. here is a picture I took: 

3. The last (actually first) upgrade I printed was an extruder nob, now this one was really helpful because before I had this I had to push the filament myself, but with the extruder nob, I could easily move the filament in and out by turning the nob. When I had printed it, it actually didn't fit on but my brother Gideon had a file to make the hole bigger so that the nob could fit on. Here is a picture I took: 


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tag:ezraharris.com,2013:Post/1553722 2020-06-03T19:03:58Z 2020-06-03T19:05:28Z Dragon SpaceX Rocket

A couple of days ago SpaceX and Nasa sent a space rocket called Dragon to the ISS (International Space Station). It was the first commercial rocket that was sent to the ISS, and it had been nine years since an American rocket was launched from America and it was flown with American pilots. The crew was Robert Behnken and Douglas Hurley. It was exciting watching the live rocket launch countdown video on Saturday, it had originally been planned to launch on Wednesday but the weather wasn't looking good so they canceled that launch and postponed it to Saturday. What was really cool is the number of viewers watching the live stream, as Wikipedia said: "The live stream was watched online by 3 million people on NASA feeds,[13] and the SpaceX feed peaked at 4.1 million viewers. NASA estimated roughly 10 million people watched on various online platforms, approximately 150,000 people gathered on Florida's space coast[14] in addition to an unknown number watching on television.paste wiki page amount of viewers". More about the launch Here.

Crew Dragon Demo-2 Bob and Dougjpg
By NASA - https://www.nasa.gov/press-release/nasa-to-provide-coverage-of-spacex-commercial-crew-test-flight-with-astronauts, Public Domain, Link

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tag:ezraharris.com,2013:Post/1550138 2020-05-26T17:18:03Z 2020-05-26T17:48:38Z 3D Printing "Baby Yoda" from The Mandolorian

Yesterday I printed a fun thing I found on Thingiverse, it was Baby Yoda from The Mandolorian Star Wars tv show (link to thing here). the first time I printed it I had scaled it down so small that it only took twenty minutes to 3D print, the next time I scaled it up and it took two hours to print, the end result was pretty good so today I painted it the colors of Baby Yoda. These are the settings I used:

Infill: 20% 

Supports: Yes

Layer Height: 0.2 

at the time that I am writing this, I am printing Baby Yoda's little floating crib!

(Above: My 3D print)


(Below: Baby Yoda)

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Harris Family
tag:ezraharris.com,2013:Post/1546977 2020-05-19T21:31:30Z 2020-05-26T17:28:06Z Analog Stick for Xbox 360 Controller

Last Sunday I 3D printed a thumbstick for my Xbox 360 controller, a thumbstick is, as Wikipedia puts it: "An analog stick (or analog stick in British English), sometimes called a control stick, joystick, or thumbstick, is an input device for a controller (often a game controller) that is used for two-dimensional input." A thumbstick is a piece that is on most video game controllers that you move around to control the objects in the video game. My thumbstick on my controller had a bit broken off of it, and it sometimes hurt when I pushed it up every time that I played a game. Then I decided to print a new one on the ender-3, I found one on Thingiverse (Here), so then I downloaded the STL file, uploaded it to Cura, then saved the data to the sd card and started printing. When the print was finished, I noticed that the supports were a little stronger then I had expected. But I was able to take off the supports using pliers, after that, I took apart my controller and was switching them when I realized that I needed to make the hole on the bottom of the thumbstick bigger so I can attach it on. I spent another ten minutes trying to drill the right size hole, once I had gotten it to fit I put the controller back together, and another problem came I needed to sand the side part down more so that it made it easier for me to move it around. Once I had done that, I tried it out, and it worked pretty well! I am excited to use the 3D printer for other parts I may need in the future.

(Above Xbox one controller thumbstick)
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tag:ezraharris.com,2013:Post/1543568 2020-05-12T18:09:21Z 2020-05-26T20:53:09Z New Domain

I purchased a domain called Ezraharris.com, now to get to my blog you can type EzraHarris.com in your search bar. More details here

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Harris Family
tag:ezraharris.com,2013:Post/1543013 2020-05-11T16:21:39Z 2020-05-11T18:12:47Z Mother's Day - It was fruit tarts and tarts with lemon custard!

Yesterday, my whole family and I drove to our Oma and Opa's house for Mother's Day. Noelle and Caleb came about half an hour later. because Caleb picked her up from the airport in Sacramento. My cousins Aaron and Nathan were there too, and a friend of my Mom's from back when she was in school came to see Mom. We ate lunch. Then I went swimming in Opa and Oma's pool. Sophie, Aaron, Nathan, and Johanna came in afterward. And we all swam for a while, then I got out and dried off, and I also took some pictures and slow-motion videos of Aaron, Nathan, and Johanna jumping into the pool. Then Jonathan brought out a dessert that he made the day before. It was fruit tarts and tarts with lemon custard, it was DELICIOUS! We brought some back home with us. After that, Aaron, Nathan, and Johanna went back into the pool, and the rest of us relaxed for a while. Then Aaron brought out the cell cake that he made for a science project. After that, we cleaned up a bit and drove back home. Here are some pictures I took:


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tag:ezraharris.com,2013:Post/1539938 2020-05-04T21:22:09Z 2020-05-08T14:38:56Z Making Changes to My Minecraft Server

Yesterday I was trying to add plugins to my server, but when I joined on the server, nothing worked. I had tried restarting my server several times. The plugins weren't working, (by the way, plugins are programs that you install on your server to make things look different I sometimes get mixed up about the difference in plugins and mods, but I am pretty sure that plugins can only change the way things look for you, and mods can only add to the game. Here is a more detailed article about the difference.) After that I asked the support team on apex's website, and they said that I didn't have Spigot installed on my server, I thought maybe I would have to pay extra if I wanted Spigot installed, so I thought perhaps I could upload the Spigot file to the server files. So I googled how to install Spigot on a server, but I kept getting the result "how to make a Minecraft Spigot server." Then I texted Nicholas about the problem. He asked for the username and password for the panel login, and I gave it to him, and he logged in and quickly found out how to install Spigot on the server, so he set up Spigot, and now I think the plugins will work I will still have to try it, but I do know that Spigot is now installed. (If you would like to join my server on Minecraft, here is the IP address: BillyBones.apexmc.co if you do not know how to join a server Here is instructions.)


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Harris Family
tag:ezraharris.com,2013:Post/1534701 2020-04-23T20:27:31Z 2020-05-26T17:28:30Z PrintrBot

About a week ago, my brother gave me his 3D printer. I had started printing some tests, and then I printed started to print mask relief straps, mask relief straps are straps for when you are wearing a mask that goes around your ears it sometimes hurts your ear, so these are for the back of your head here is the model for it on a 3D printing website. But when I printed some, the problem was is that it was meant for people who have a lot of hair on the back of their heads; otherwise, it slips down. But I looked around a little more on Thingiverse, and I found a remix of it with a comb, Here is the model for that. The next day my Mom had needed me to print about 100 of them for the masks that she is selling. So I started printing but, the 3D printer that Nicholas gave me could only print one at a time and it took 40 minutes each so my brother Nicholas brought over his other 3D printer the Ender-3 and I started printing on there. I print about 25 mask relief straps a day. Here is a timelapse of the ender-3 printing mask relief straps: 

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tag:ezraharris.com,2013:Post/1530890 2020-04-13T22:18:59Z 2020-04-16T16:46:22Z Soap - History of Inventions - Lesson 32

We use soap every day for bathing, washing our hands, etc. Before soap was invented, the Romans had used oil then they would scrape it off with a metal scraper. We do know for sure when soap was, invented, but there is a story of how the Romans were sacrificing animals on a mountain called Mt Sapo, the animal fat combined with the ashes created soap. But that is probably not a true story. Ancient Egyptians had also written down on a papyrus a recipe for soap, but we are not sure if that was just used for cleaning the wool when they made clothes.

But around 200 AD, there was a man named Galen, who was a doctor for several Roman emperors. He wrote down that the best soap came from the Germans and the Gauls. In 500AD there was a soap guild in Italy, in 1200 AD England started making large quantities of soap, in 1400 AD France also began to make lots of soap near Marseille, and in 1800 AD there were soap factories.

Soap is made with Lye and animal fat or plant fat. The process for mixing them is called Saponification.

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Harris Family
tag:ezraharris.com,2013:Post/1528416 2020-04-07T21:39:08Z 2020-04-08T04:24:20Z The Creek Trails

Yesterday I went on a walk from our house to the cottonwood creek and explored around that area (btw the cottonwood creek feeds into the Sacramento River). Then I walked to our community campground explored that area for a while. Then I went back to the creek, but instead of taking the usual path, I took a different way that led into the swamp. The swamp is a very wet and muddy place that is right next to the creek, so I called it the swamp. Here is a map that I drew on my computer of the creek area:

My Dad and I had chopped our walking sticks from one of the trees in the swamp, and now we use them every time we walk down to the creek. The reason why I had walked down to the creek area is that I was looking for an excellent spot to build a hut with my Dad. Unfortunately, I didn't find one, but we are going to walk down there again later today to look again
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tag:ezraharris.com,2013:Post/1526309 2020-04-03T21:45:26Z 2020-04-10T22:20:40Z The iMac

About a year ago, we had been given an old 2009 iMac from some of our friends. The iMac was slow, but we used it for our schoolwork. I had wanted to reset the computer, but I wasn't sure if it would ruin the computer or not, but eventually, I decided to reset the computer. Well, it didn't work, it had not gone back to its original program, and since I never created a backup, it was just stuck in the "select a drive" state. I had worked hours trying to get it to work. But nothing I did worked, so the iMac just sat there in my room for about three or four months. Until recently when I remembered that Nicholas had installed Ubuntu on a USB flash drive for his desktop computer, so I looked up how to install Ubuntu on a mac computer it said " to plug in the USB flash drive then turn on your mac hold down alt/option and select the USB drive and then press the install" I followed the steps, and it started installing Ubuntu. I was very excited that it was going to work finally. I went through the ubuntu setup process then it was set up and ready, except for one thing the wireless internet chip driver for Ubuntu wasn't installed, so I looked up how to fix that, and there was a lot of answers that I tried, but none of them worked. I don't know whether I didn't do the instructions right or not or if the version was wrong. But I skype called my brother, Nicholas, who has used Ubuntu before and who would know how to fix the problem. I had screen shared my screen on the iMac, and he helped me fix the problem. I didn't understand everything that he told me to do, but he said that the computer needed a CD for installing the driver for the wireless internet chip. But he was able to make the USB flash drive seem like a cd to the computer, and the computer downloaded the driver. The iMac is now working, and I use it for schoolwork and skype.

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Harris Family
tag:ezraharris.com,2013:Post/1523431 2020-03-24T23:32:46Z 2020-03-25T09:40:16Z Stop-motion

There is a type of video called stop-motion; stop motion is a ton of photos played fast and that forms a video. I tried out an app called stop motion studio. Stop motion studio is an easy cheap app that you can use to take pictures on, and once you are finished you can play the photos together as a video, you can also adjust the speed of the film. and you can add sound effects, green screen backgrounds, titles, and more. I had purchased the pro version of the stop motion studio because if you don't the app will only allow you to use the camera and the photo playback. I love that I can use the greenscreen because it sometimes helps when I don't have a good background. Here is a film with legos that I did earlier: 

 

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tag:ezraharris.com,2013:Post/1518913 2020-03-16T21:59:35Z 2020-03-16T22:09:27Z Spread and Adoption of the Wheelbarrows - History of Inventions - Lesson 31

The most common type of wheelbarrow used today by China is a type of wheelbarrow where the wheel is in the middle of the wheelbarrow. Here is a picture of that: 

The center wheel design is also used for carrying people around on it, and it could hold up to six people on it! Some of the Chinese wheelbarrows had sails on them for easier pushing/pulling if it was a big load and if they were going a long way, here is a picture of that: 

The Europeans had probably come up with the idea of the wheelbarrow by themselves because there is no trace of the Europeans getting the invention of the wheelbarrow from China. I find interesting that China had used sails on their wheelbarrows for helping them to push or pull it around.

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Harris Family
tag:ezraharris.com,2013:Post/1519608 2020-03-16T21:31:57Z 2020-04-10T22:20:55Z iPhone 11

About a week ago, an iPhone 11 arrived in the mail. It had was bought by my uncle. It is for my grandpa and grandma who is going to move back to Lake California. Once it came in, I logged into my Grandpa's Apple ID, and then I had started setting up the iPhone. The iPhone 11 does not have an actual home button like most other types of iPhones, but instead, you just swipe up on the screen and does the same thing as a home button, if you don't know what a home button is, it is the button on the bottom of the iPhone (shown in the image below)

The reason why it does not have a home button is that the screen fills up the whole front of the iPhone 11. The iPhone 11 also has some other perks, most of the different iPhone versions don't have. But I am still figuring those out. 
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tag:ezraharris.com,2013:Post/1517278 2020-03-06T22:47:58Z 2020-03-07T18:16:58Z Wheelbarrow - History of Inventions - Lesson 31

A wheelbarrow is a tool used for agriculture, and construction, it is meant for moving sand bricks weeds, etc. It benefited the workers because you wouldn't have to use a horse to pull a carriage to transport materials if it is a short distance. After all, it would take to long to hitch up a horse to a wagon for just a small range. It was also useful because it was small enough for going in tight spaces rather than a truck that could only move around in bigger areas, and the wheelbarrow helped with the health because it prevented backs from being broken. A Chinese man named Zhuge Liang (181 AD - 234 AD) was the first to invent the wheelbarrow, he had invented it for moving war supplies around quickly when he was in war with a rival clan who were fighting for the throne. It was used a couple of times for people who could not walk basically as a wheelchair.

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tag:ezraharris.com,2013:Post/1516210 2020-03-03T23:17:04Z 2020-03-03T23:17:14Z Sailing Before the Compass - History of Inventions - lesson 29

Before the compass, many people had to rely on landmarks for sailing. The Polynesians sailed around there own area by using the stars to tell them where they were, and they also used waves to tell where land is because the waves get affected by the islands. The Europeans used landmarks, the stars, and the familiar winds that blew by them as they were sailing. It was almost impossible for most people to sail in the winter because it was always cloudy and you couldn't use the stars to tell you where you were. In that case, you could end up in entirely different countries. I think it is pretty interesting how the Polynesians used the waves to tell them how near they were to land.

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tag:ezraharris.com,2013:Post/1515800 2020-03-02T22:42:46Z 2020-03-02T22:55:04Z Mustard

I watch a youtube channel called Mustard. Mustard is a channel that makes history videos about different inventions. In most of the videos I watched, he talked about aircraft. for example, in the most recent one, he explained the history of giant flying boats. It is called: what happened to giant flying ships? That video talks about when giant flying aircraft first came out and what they had been used for, and why they don't use them anymore. I like the videos a lot because he makes the videos very interesting because he makes a model of the subject he is talking about, and that sometimes he adds a bit of humor to the video.

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Harris Family
tag:ezraharris.com,2013:Post/1511648 2020-02-20T22:11:01Z 2020-03-03T22:54:21Z Benefits of a Roman Aqueduct - History of Inventions - Lesson 27

Rome borrowed the idea of the aqueduct from the Etruscans and the Greeks, but the Romans perfected the idea. They perfected it by bringing lots of fresh clean, and consistent water to the city, it also benefited the sewage system because the aqueduct provided consistent water to flush the gross stuff out of the city, another benefit is irrigation. The Romans were master builders, so they only put 10% of the aqueduct above ground in case there was a war, they wouldn't want there enemies knowing where to stop the water flow into the city. And they built stackable bridges for the aqueduct rather than two side-by-side bridges for the water to travel. For the Romans to keep the water flowing to the city, they built the aqueducts very slightly slanted over many miles. I am fascinated by how much water the aqueduct would have to bring into the cities by rainwater or rivers or by the mountains

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Harris Family
tag:ezraharris.com,2013:Post/1511298 2020-02-19T22:11:33Z 2020-02-20T18:02:06Z What Roman Aqueducts Are - History of Inventions - Lesson 27

An aqueduct is a man-made channel that lets the water flow into the big cites. We use running water daily, and for an example, your shower will have running water when you turn it on or when you are using your faucet to wash your hands or to clean the dishes. The Romans didn't invent the aqueduct, but they perfected the design of the aqueduct. Here is an image of how a Roman aqueduct works: 

The water would be collected from a lake or river and taken down a tube to the inspection shafts, and then it would go through to the settling tank. From there, the water would go over a bridge, and then the water would be led into the distribution tank and then into different places in the city. I like the bridges for the water because they let the river go through, and they can hold water at the top.
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Harris Family