In today’s podcast, a teaser for our hour-long Sperm show. If you think you learned all there is to know from that junior high school filmstrip, think again.

We give you two short pieces on sperm that hint at the new ideas and amazing stories we came across once we started following the trail of this wriggly little cell. First, in a twisted tale of twisted tails, fertility specialist Joanna Ellington, cofounder of ING Fertility, gives Robert a guided tour of all the sperm that are doomed to fail. Then Tim Birkhead, a biologist at the University of Sheffield, tells Jad and Robert how a dead wood mouse completely upended the idea that it’s “every sperm for himself.”