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Publisher's Summary

In this issue:

"Rise of the Tyrannosaurs": The fearsome T. Rex turns out to be a late descendant in a family of surprisingly humble, mostly human-sized creatures.

"Lifting the Curse of Alzheimer’s": As the search for treatment turns to prevention, a couple of dozen Columbian families with a rare genetic form of the disease have emerged to play a key role.

"The Search for a New Machine": Computer chipmakers are betting billions on new technologies to improve performance.

"Waves of Destruction": The disappearing Arctic sea ice has given rise to towering waves that have far-flung effects on climate and ecology.

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