<human>:  Who was the first person to see bacteria with a microscope?
<bot>: Antonie van Leeuwenhoek was the first person to see bacteria with a microscope. In the late 1600s, he was the first person to use a microscope to observe living organisms. He used a simple microscope made of two lenses, a convex lens and a concave lens, and he made his own lenses from ground glass.