Booming Sands (Jan. 2005)

Scientists look into a generations-old conundrum: how and why do certain sand dunes produce mysterious noises? Watch now (7 mins.)

Capturing Carbon (July 2008)

An eighth-grader's science fair project prompts her scientist father to develop a new way to pull excess carbon dioxide out of the atmosphere. Watch now (12 mins.)

Diamond Factory (June 2009)

Visit a laboratory where entrepreneurs are growing perfectly pure diamonds. Watch now (15 mins.)

Fastest Glacier (Jul. 2005)

A glacier moving way too fast reveals how unpredictable the effects of global warming can be. Watch now (7 mins.)

Hurricane Katrina (Oct. 2005)

Scientists' warnings proved sadly prescient about New Orleans' risk from hurricanes. Watch now (4 mins.)

Hurricanes (Jan. 2005)

Predicting a hurricane's intensity is notoriously difficult, but new tools may make it easier. Watch now (12 mins.)

Lightning (Oct. 2005)

Experts still aren't sure what triggers it, but they suspect cosmic rays from outer space. Watch now (9 mins.)

Mass Extinction (Nov. 2006)

What caused the mother of all extinctions 250 million years ago? Watch now (13 mins.)

Space Storms (July 2008)

Behind the dazzling display of the aurora borealis are space storms that could turn the lights off here on Earth. Watch now (10 mins.)

Stronger Hurricanes (Jan. 2006)

Is global warming making hurricanes more intense? Watch now (6 mins.)