Eric, I think we should take this off-line if you want to buy a copy. Use the e-mail link at www.fredbortz.com

But in brief, Collision Course! Cosmic Impacts and Life on Earth went out of print prematurely in a corporate bankruptcy/sale. It does in fact reference Armageddon and Deep Impact in its Prologue. Its science is, in the main, still current although the thinking of how to save Earth has undergone some changes.

I always expected that some of the science might change, so I included an updates and links page to respond to that.

If your "Little Brother" wants an autographed copy, I still have a few left. Unfortunately, the hardcovers don't come cheap, so I'd recommend a trip to the library for those who might find Collision Course! to their liking.

There are also other books on the subject, but the good ones are all in hardcover only. Each of them takes a slightly different tack. I'd suggest you follow my Amazon.com link and then look at the links for similar titles. I'm thinking of one published by Lerner.

Fred Bortz -- Science and technology books for young readers (www.fredbortz.com) and Science book reviews (www.scienceshelf.com)