sciencehabit writes: DNA is better known, but many researchers today believe that life on Earth got started with its cousin RNA, since that nucleic acid can act as both a repository of genetic information and a catalyst to speed up biochemical reactions. But those favoring this “RNA world” hypothesis have struggled for decades to explain how the molecule’s four building blocks could have arisen from the simpler compounds present during our planet’s early days. Now chemists have identified simple reactions that, using the raw materials on early Earth, can synthesize close cousins of all four building blocks. The resemblance isn’t perfect, but it suggests scientists may be closing in on a plausible scenario for how life on Earth began.
"More software projects have gone awry for lack of calendar time than for all
other causes combined."
-- Fred Brooks, Jr., _The Mythical Man Month_