What's John watching?

Building the Ultimate: Spacecraft: All this excitement about the Mars Exploration Rover Mission has really rekindled my interest in space. This show perfectly complemented an article I read - yesterday, I guess - on Columbia's final minutes. Really an excellent read.

I love demonstrations, and this show had some great ones. How 'bout trying to hit the edge of a piece of paper from a football-field distance? That's what Apollo crews had to do on their return trips from the Moon (well, the ones that went there). The price of failure? Either bouncing off or burning up in Earth's atmosphere! No pressure, guys! ¶ 10:41:00 p.m.