NOVA

Through interviews with astronauts, their families and members of the Columbia Accident Investigation Board, this program gives viewers a new look at the Columbia space shuttle tragedy - and at NASA itself.

A revolutionary new branch of math called fractals has changed the way we see the world and opened up a vast new territory to scientific analysis and understanding.

NOVA investigates the furious scientific debate raging over what "Hobbit" bones represent.

San Francisco veterinarian Dr. Frances Gulland is committed to saving sick marine mammals, but she's also desperately trying to figure out what's killing them.

NOVA flies along with the monarch butterflies, visiting the spectacular locations they call home and meeting the dangers they encounter along the way.

A provocative new theory about what killed off America's mammoths at the end of the last Ice Age.

Stunning breakthroughs in a new science - nicknamed "evo devo" - are revealing answers to the riddles that Darwin couldn't explain.

Since its discovery in 1930, Pluto has held a warm place in the public imagination. So, when the American Museum of Natural History's Hayden Planetarium stopped calling Pluto a planet, director Neil deGrasse Tyson found himself at the center of a firestorm-a firestorm led by angry, Pluto-loving elementary school students. But what is it about this cold, distant rock that captures so many hearts?