"No one can pretend to say that a fish is ever killed by heat, for many kinds of fish, in the middle of summer, and in the burning heat of the sun, do either play, as it were, on the surface of the water, or hide themselves under the leaves, weeds, or other substances at the bottom."
Antonie van Leeuwenhoek was a Dutch scientist and microscopist widely regarded as a founder of microbiology. His microscope observations described microorganisms, blood cells, and sperm cells with unprecedented detail for his era.