Doesn’t look a day over 40 million, right? This fossilized sperm and its compatriots turned up in a 50-million-year-old worm cocoon in Antarctica. And it has some pretty exciting implications for scientists—aside from the obvious news that we’re looking at a loser of an eons-old swimming race.
Ordinarily, squishy worms don’t wriggle into the fossil record. Their boneless bodies tend to disappear from history, just like the soft parts of animals with skeletons. That’s why scientists don’t