Henry Spencer

Supplying fuel for a Mars expedition from the lunar surface is often suggested, but it's hard to make it pay off - Moon bases are expensive, and just buying more rockets to launch fuel from Earth is relatively cheap.

I watch TV on my TV pretty exclusively. However, when I'm on that long flight between Los Angeles and New York, a great way to pass that time is to download movies on iTunes and watch them on my laptop.

I was only 8 years old on July 20, 1969, when Neil Armstrong, 38-year-old commander of 'Apollo 11,' descended the cramped lunar module Eagle's ladder with hefty backpack and bulky spacesuit to become the first human on the moon.