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Over the past decade, however, the study of ancient DNA, recovered from fossils up to around 400,000 years old, has revealed startling new twists and turns in the story of human history.

For the first time, a complete DNA sequence from Africa dating back thousands of years has been recovered. The DNA of this Ethiopian man sheds new light on the movement out of Africa, and also movement of Eurasians back into Africa.

Where Right Wing Conspiracies Come From. Burned at McDonald's. Documentary: Peace Officer. Buffett's $1B March Madness Bet. LBJ & the Voting Rights Act.

It's now possible to modify the human germ line, and the rules haven't caught up with the science. The best way to respond to concerns created by emerging knowledge or early-stage technologies is for scientists from publicly-funded institutions to find common cause with the wider public about the best way to regulate — as early as possible. Once scientists from corporations begin to dominate the research enterprise, it will simply be too late.

Which bird is closest to the saltwater crocodiles, American alligators and the slender-nosed Indian gharial? Either the chicken or the ostrich, depending on how you look at it. If a genome is a shelf of books, then the chicken has been a better librarian, but the ostrich has been a more faithful translator.

Thanks to new technology, we know now exactly which microbes are crawling behind our ears, between our eyebrows, and especially on our feet. Kent Sepkowitz explains the gross new study.