Moon Walks and Moon Rocks.

After millions watched the first Moon walks in 1969 with amazement and the near-fatal Apollo 13 accident with anxiety, lunar landings began occurring with such regularity and precision they became almost commonplace. In 1971 and 1972 there were two landings a year, each nearly a carbon copy of the other. With the Command Module orbiting overhead, the crew landed a Lunar Excursion Module (or LEM, but constantly being renamed: Eagle, Falcon, Challenger) on the Moon's surface. Each landing was a memorable moment for the public-relations specialists. The Apollo 14 mission included Alan Shepard lightheartedly hitting a golf ball on the Moon. On the Apollo 15 landing David Scott demonstrated the effects of zero atmosphere by dropping a hammer and a feather at the same time. Astronaut James Irwin kept the camera rolling as both struck the Moon's surface at the same time. Each...