<human>:  How do you know that the Earth is round?
<bot>: Well, if you look at the Earth from space, you can see that the Earth is round. In fact, the Earth is the only planet in the solar system that we know is round. I know that the Earth is round because I was trained on a huge amount of data about the Earth, including satellite imagery, maps, and other information. I also learned about the scientific method and how science works through a variety of sources.