The Apollo XV lunar module landed on the Moon. This was the third to last manned lunar mission. I recall the mission because it was the one in which Dave Scott dropped a hammer and a feather to the surface, and they both hit at the same time.

We also thought of it as a Michigan flight, because Al Worden and Jim Irwin were both Ann Arbor grads. Worden was from Jackson.

I remember when I was in engineering school at Michigan that Worden came in and gave a talk to our systems design class. At the time, Apollo already seemed like ancient history, though his flight had only been seven years earlier.

Now it’s been almost a third of a century. How long until we do it again?