John Crewdson

  • Rethinking the Mammogram Guidelines

    Many are dismissing the new breast cancer recommendations as a hasty reversal of years of authoritative medical advice. But evidence weighing against screenings for women in their 40s has in fact been mounting for years.

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How to Build a Tornado

A Canadian inventor believes his tornado machine could solve the world's energy crisis.

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A New York City Minute, Frozen in Time

This short film takes you on a whirling tour of the Big Apple

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What Happened to the Milky Way?

Light pollution has taken away our ability to see the stars. Can we save the night sky?

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The Pentagon's $1.5 Trillion Mistake

The F-35 fighter jet was supposed to do everything. Instead, it can barely do anything.

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