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.
©2009 Scientific American