DARPA's $20 million Preventing Sleep Deprivation (PSD) program aims to find ways for soldiers to stay awake and effective for as long as seven days. Dolphins and whales are providing a promising direction. These mammals survive on something called "hemispheric sleep," a state in which one side of the brain is awake while the other is unconscious.
This Year's Best Gear
From toys and tools to gadgets and four-wheel fun, we give you the rundown of the most exciting new goods.
Plus: A Look Inside the Global Ivory Trade
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