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Blocking HIV's Attack

Scientists have rid one man of HIV by preventing the virus from entering certain immune cells. But the treatment was dangerous and likely unrepeatable. Can they figure out a safer, more broadly achievable way to help millions more?

By Carl June and Bruce Levine

Dinosaurs of the Lost Continent

The American West once harbored multiple communities of dinosaurs simultaneously—a revelation that has scientists scrambling to understand how the land could have supported so many behemoths

By Scott D. Sampson

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