Science Birthdays, December 7

Today is the birthday of Theodor Schwann, born in 1810, he discovered pepsin in 1836, it was then called a ferment, in 1839 he elaborated on the existing cell theory proposed by Mathias Schleiden, and said all things are made of cells, he called it the cell theory, It is sometimes called the Schleiden and Schwann Cell Theory, he also coined the term metabolism.

Gerard Kuiper, born in 1905, detected carbon dioxide on mars in 1948, and showed the ice caps were ice, he discovered an atmosphere on Titan, discovered Miranda, Nereid, proposed a theory in 1951 that planets were formed from protoplanets.

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