We finally have a mathematician on the show, Rob Root. He and his daughter, Gina, join us to talk social justice, numbers, math, maths, equations, sharks, obscure Vassar references, some math jokes, conjectures, math stuff, and math. We have a double round of 10-20-30 music (one of them 10-15-20); we have a quiz; we have Fridays and Sundays. The usual. After you listen—or before, we don’t actually check, you know that, right?—follow us on twitter @somelaterdate, like us on Fb, check out our Spotify channel, rate us on iTunes, and subscribe. Thanks to Michelle for Producing, Ian for Fact Checking, and Will for Playlisting. Credit to the Beastie Boys and Boz Scaggs.