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Publisher's Summary

In this issue:

"What Makes Us Human?": Comparisons of the genomes of humans and chimpanzees are revealing rare stretches of DNA that are ours alone.

"Could Food Shortages Bring Down Civilization?": One of the biggest threats to global stability is the potential for food crises to cause government collapse in poor countries.

"The Planetary Air Leak": Many of the gases that make up Earth's atmosphere are slowly leaking into outer space.

"How to Steal Secrets Without a Network": Information thieves can now do an end run around encryption, networks and operating systems.

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