NPR science correspondent and Radiolab co-host Robert Krulwich joins us for this landmark meeting of the minds. We cover scientific principles including force = mass x acceleration (as in "How do you construct a sandwich that will withstand the force of the bite, without having the mass of the sandwich accelerate out the back?") and the Pythagorean theorem as it pertains to sandwich construction. This is a replay of a classic episode from our first few months on the air!

Also of note this week: Mark is hosting our first ever European meetup, in Berlin on September 10. Details are here.