Dig in to the Physics of Donuts for National Donut Day!

Before you ingest your annual delicious (possibly free) treat for Friday's annual celebration, why not learn about the physics of donuts? From topology to nuclear fusion, donuts are the physicist's breakfast pastry of choice. Not just because they're tasty, but because their shape, the torus, is the subject of fascinating physics. Let's dig in to some of the multitude of donut sightings in physics, and answer the age-old question: Which rolls downhill faster, the holed donut or the filled doughn...