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Publisher's Summary

In this issue:

"The Ethics of Climate Change": Weighing our own prosperity against the impact of climate change on our grandchildren's lives requires economists to make tough calls.

"The Tunguska Mystery": What could a mysterious explosion in a Siberian forest 100 years ago have to do with the future of our planet?

"Gaining Ground on Breast Cancer": The newest targeted therapies are helping doctors to tailor increasingly effective treatments to individual patients.

"The Neurobiology of Trust": Our inclination to trust a stranger stems in large part from exposure to a small molecule known for an entirely different task - inducing labor.

"What Is a Species?" A better definition can influence which animals make the endangered list.

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