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D.A. Pennebaker used portable cameras and redefined documentary filmmaking. Pennebaker was best known for Don't Look Back, The War Room, and Monterey Pop. He died Thursday at 94.

A judge said these untraceable weapons that can be printed from directions downloaded off the Internet could end up in the wrong hands. But some plans have been on the Internet for days.

Our country needs more people with science, math and engineering degrees — at least, that's the common refrain among politicians and educators. Yet new numbers show people with doctoral degrees in those subjects increasingly struggle to find employment.

Librarians across the U.S. examine how restrictions on library content are shaping communities.

Animal parents must balance risk and reward to raise their young in grasslands.

How will human-like robots change our future and how we see ourselves?

Shattering the foundations of white supremacy over 10 memorable weeks in 1964.

Take a cross-country journey to explore the rise and fall of America's favorite planet.

What made Haiyan so destructive, and how can we prepare for the next monster storm?

Detailed satellite images reveal the web of connections that sustain life on Earth.