The origins of life.
Found this interesting article about experients performed that synthesize ribonucleotides in a “natural” manner.
According to Sutherland, these laboratory conditions resembled those of the life-originating “warm little pond” hypothesized by Charles Darwin if the pond “evaporated, got heated, and then it rained and the sun shone.”
It’s very interesting and I think it could also apply to the surface of comets or anywhere you would have radiation and these precursor materials.