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Publisher's Summary

In this issue:

"Traces of a Distant Past": The paths our ancestors took out of Africa have been lost in time. However, hints of them have survived in the genetic landscapes of populations created along the way.

"The Neuroscience of Dance": Recent brain-imaging studies reveal some of the complex neural choreography behind our ability to dance.

"Hands-On Computing": Multi-touch screens could improve collaboration without a mouse or a keyboard.

"No-Till: The Quiet Revolution": Because plowing degrades the land, farmers are increasingly turning to a more sustainable alternative.

"New Jobs for Ancient Chaperones": With newly recognized roles in cancer and immunity, the heat shock proteins that normally protect cells against stress might become therapeutic allies.

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