2h 9min, jan 21, 1855 y - C. Naegli and C. Cramer: They discovered the cell membrane as they realized there must be another barrier or osmosis would not make sense.
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They discovered the cell membrane as they realized there must be another barrier or osmosis would not make sense.Added to timeline:
Date:
2h 9min, jan 21, 1855 y
Now
~ 170 years ago