Recently I came across an excellent video that brings to life an age-old physics teaching theme... The world’s largest vacuum chamber is NASA’s Space Power Facility in Ohio, pictured below. They remove around 30 tons of air from the chamber in order to test equipment during in-space conditions. But in this video the facility is being borrowed to settle an old question about a bowling ball and a feather. It’s one thing to hear it from a teacher or read about it in a textbook; it’s quite another to see it for yourself. It's only a few minutes long, so I thoroughly recommend watching and bookmarking it!