Happy New Year! To celebrate, we're digging into the science of the year: Why is it 365 days, is it changing, and will we always celebrate New Year's the same way? Plus, we recap our favorite episodes of the year.

Why Are We Going Back to the Moon?
33:37

Introducing: Mostly Human with Laurie Segall
02:16

Should We Mine the Asteroid Belt? (feat. Phil Plait)
34:30