Discoveries of Antonie van Leeuwenhoek: Pioneering work in microscopy and microbiology.
A slide titled "DISCOVERIES" listing achievements of Antonie van Leeuwenhoek, including making over 500 optical lenses, creating 25 single-lens microscopes capable of magnification up to 275 times, making about 200 microscopes with different magnifications, and using samples to measure microorganisms in water.