Does a supermassive black hole lurk at the center of our galaxy?

Researchers from Indonesia to Greenland unearth clues to the greatest volcanic eruption of the last 100,000 years.

Follow one man's quest to engineer a submarine with panoramic views.

Who perpetrated Piltdown Man, the greatest scientific fraud of the 20th century?

What unleashed a catastrophic flood that scarred thousands of square miles in the American Northwest?

Is the Vinland Map a priceless depiction of the New World made before Columbus's voyage or a 20th-century fake?

Who were the first Americans, and where did they come from?

How and why did man's best friend evolve from wolves, and why are dogs so remarkably diverse today?

Tornado-chasing scientists with an eye to better forecasting risk their lives to plumb the secrets of nature's most terrifying killer.

Examine the complex case of Typhoid Mary, a cook who was quarantined for life against her will in the early 1900s.

Eleven dimensions, parallel universes, and a world made out of strings. It's not science fiction, it's string theory.

Is the magnetic field protecting Earth from deadly radiation about to reverse direction or even disappear?

Meet Rosalind Franklin, the unsung heroine behind the discovery of DNA's double helix.

Galileo struggles to persuade church authorities of the truth behind his astonishing discoveries about the cosmos.

Judah Folkman and other researchers pioneer a novel approach to cancer treatment.

Genetically modified foods—a wondrous advance or a new threat? Explore the growing controversy

The tobacco industry's quest for a "safer" cigarette is filled with promise and pitfalls.

Life-threatening eating disorders such as anorexia and bulimia are on the rise among America's youth.

Meet the young patent clerk whose ideas about light, space, and time have transformed our view of the universe.

Lennart Nilsson's extraordinary microphotography reveals a world we've never seen—within and on ourselves.