hypothesis
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TIL about the RNA world hypothesis. The many roles of RNA in protein synthesis, including the ribozyme nature of the peptidyl transferase activity of the ribosome, suggest that RNA evolved as an informational biopolymer before proteins, and even before DNA (and presumably before cells).
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whatilearned
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TIL that in 1929, determined to prove his hypothesis, Werner Frossman tricked a nurse, inserted a catheter through his own arm, and walked with the inserted tube to an x-ray lab to photograph his discovery, thereby inventing cardiac catheterization and winning a Nobel Prize for it later.
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whatilearned
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