Today is March 14, otherwise known as Pi Day (for 3.14). And although this particular clip has little to do with the iconic mathematical constant, it seems appropriate to watch Carl Sagan's original "Cosmos."
"If you wish to make an apple pie from scratch, you must first invent the universe," explained the late astronomer and astrophysicist. You can also use Sagan's recipe for apple pie.
Sarah Gray is an assistant editor at Salon, focusing on innovation. Follow @sarahhhgray or email firstname.lastname@example.org.