Deep Look | Here’s How That Annoying Fly Dodges Your Swatter | Season 7 | Episode 20 | PBS

A fly has a pair of tiny, dumbbell-shaped limbs called halteres that were once a second pair of wings. They wield them to make razor-sharp turns and land out of reach on your ceiling. But don't despair – there *is* a trick to smacking these infuriating insects.