Here's a breakdown:
* Robert Hooke (1635-1703) was an English scientist and architect.
* In 1665, Hooke used a compound microscope to examine a thin slice of cork. He noticed that the cork was made up of many tiny, box-like compartments which he called "cells" because they reminded him of the cells of a monastery.
* Hooke's discovery was significant because it was the first time that anyone had observed the cellular structure of living things.
* It was Anton van Leeuwenhoek, a Dutch scientist, who later used a more powerful microscope to observe living cells, including bacteria and protozoa.
So, while Hooke is credited with the initial discovery of cells, it was van Leeuwenhoek who further explored and documented the cellular nature of life.