Antoni van Leeuwenhoek

Born in Delft in 1632, Antoni van Leeuwenhoek was not a university-trained scientist but a tradesman with an unusual gift for careful looking. He worked as a draper and city official, yet became famous for making remarkably powerful single-lens microscopes and using them to study everyday things with extraordinary patience.

Through letters sent over many years to the Royal Society in London, he described red blood cells, sperm cells, and countless tiny living creatures in water, plaque, and other samples. He is widely remembered as a pioneer of microbiology because he was the first to observe bacteria and protozoa clearly and report them in detail.

Leeuwenhoek stayed in Delft for most of his life and kept exploring the natural world until late old age. He died in 1723, but his work helped change the way people understood life itself: not as something visible only to the naked eye, but as a much richer world waiting to be magnified.