Should you decide to venture into a field to take in the next lunar eclipse, it's best to have most of these supplies on hand.

We've had a good run of it. In the 500,000 years Homo sapiens has roamed the land we've built cities, created complex languages, and sent robotic scouts to other planets. It's difficult to imagine it all coming to an end. Yet 99 percent of all species that ever lived have gone extinct, including every one of our hominid ancestors. In 1983, British cosmologist Brandon Carter framed the "Doomsday argument," a statistical way to judge when we might join them.

These little creatures saved New Orleans from mosquitoes and the illness they carry.

Extinct North American animals during last 10,000 years.

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