If you’re like me, you had a hard time believing your seventh-grade physical science teacher when he told you that, without air resistance, a feather and a bowling ball would fall from an airplane to the Earth at exactly the same speed.

While I eventually accepted this as truth, I never thought I would actually see it happen. But here we go, courtesy of NASA’s giant vacuum, which is virtually air-free. And just like Mr. George said, the fall is perfectly synchronized.