<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. He discovered the bacteria by using a compound called methylene blue. He found that when he placed a drop of water on a piece of paper, he could see the bacteria with a microscope. He was the first person to use a compound to stain bacteria, and this discovery led to the development of the field of microbiology.