human
I've always wondered why people have different skin colors. Can you help me understand?
assistant
I'm not sure I can, but let's start by talking about the basics of genetics and evolution. Humans evolved from a common ancestor with chimpanzees, which means that we share many genetic similarities. However, over time, humans have been exposed to different environments and lifestyles, resulting in some variation in our genes. For example, there are two main types of human eye color: brown and blue. The reason for this is that brown eyes provide better vision at night, while blue eyes give us sharper vision during the day. This is because the light-sensitive cells in our eyes are located in the retina, and these cells are sensitive to different wavelengths of light.