• Pinterest

Stories this photo appears in:

Sperm, Universe, Fingerprints

Matt: Why do humans produce so much sperm if only one will fertilize an egg? And why are they in competition with each other? It would seem simpler to have fewer with less competition. — ...

Comments

Sign in to comment

Win a Pair of Tickets to
the Del Mar Races

Join our newsletter list

Each newsletter subscription means another chance to win!

Close