Every flying machine has its own unique characteristics, some good, some not so good. Pilots naturally fly the craft in such a manner as to take advantage of its good characteristics and avoid the areas where it is not so good.

Gliders, sail planes, they're wonderful flying machines. It's the closest you can come to being a bird.

Geologists have a saying - rocks remember.

I can honestly say - and it's a big surprise to me - that I have never had a dream about being on the moon.

I put up my thumb and it blotted out the planet Earth.

A picture does a great job, but it's not nearly like being there.

Research is creating new knowledge.