TIL about the RNA World hypothesis, which suggests that life on Earth began only with self-replicating RNA molecules. This is supported by RNA's ability to store, transmit, and duplicate genetic information, as DNA does, and to perform enzymatic reactions, like protein-based enzymes.

https://en.wikipedia.org/wiki/RNA_world#Support_and_difficulties
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1gwoz6r/til_about_the_rna_world_hypothesis_which_suggests/