If you've ever watched footage of a spacewalk, you've seen an astronaut outfitted in an extravehicular mobility unit (EMU), the spacesuit specially designed for astronauts working outside of spacecraft orbiting Earth at 17,220 miles per hour.

In a recent episode of Tested, Norm met up with Terry Dunn, Training Operations Manager at NASA's Neutral Buoyancy Lab, to learn a little more about this iconic space suit, which remains in use to this day. (The design ‚Äď from the space diaper to the snoopy cap ‚Äď has gone virtually unchanged for decades, but there's talk of replacing it with this snazzy Z-series suit.)