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)
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.
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.
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.
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