There are a lot of reasons for not doing something. And if humanity had come up with all the reasons for not doing something we wouldn't have spread across the Earth the way we have. There's a curiosity, and I would submit that that curiosity will put human beings on the surface of Mars.

The feeling of reduced gravity and the limitations of the space suit resulted in a slow-motion movement. Perhaps not too far from a trampoline, but without the springiness and instability.

Russia perhaps is still entertaining the possibility that the moons of Mars might have access to ice or water.

It was designed to have an impact on the stalemate over Mutually Assured Destruction with the Soviet Union. Us reaching the moon convinced Gorbachev and other leaders that the Soviet Union couldn't compete with the U.S., so they revised their agenda. But people have short memories.

I didn't start skiing until I was 50. My wife Lois taught me how to ski. I'm proficiently conservative.

A space program that truly goes somewhere! With his deeds, not only words, President Obama has revitalized our struggling space program.

There should be an international lunar base. That is certainly doable.