Robert Hooke (${}1635$–${}1703$) was an English scientist who made critical early contributions to microscopy. He used a microscope of his own design to make numerous observations, which he published in his famous book, Micrographia, in ${}1665$. While viewing a thin sample of cork tissue, Hooke became the first to observe distinct, honeycomb-like structures. He described them as 'small Boxes or Bladders of Air' and coined the term 'cell' (from the Latin for 'small room') to name them. At the time, Hooke was not aware that the cork cells were long dead and, therefore, lacked the internal structures found within living cells.