CERN scientists prepare to restart the Large Hadron Collider to examine the world's tiniest particles.
Efforts to secure, raise and salvage the Costa Concordia cruise ship which capsized off the Italian coast on Jan. 13, 2012, killing 32 people.
Scientists explore the underlying forces behind sinkholes.
Archaeologists and engineers build a 25-foot lifting machine and trap-door system to release a wolf into the Colosseum's arena.
How the ancient people of Petra built their city of stone.
Istanbul's Hagia Sophia survives numerous earthquakes.
Exploring math's power across the centuries, from the first wireless radio transmissions to the landing of rovers on Mars.
The Hubble Space Telescope's discoveries over the past 25 years.
Ocean explorer Robert Ballard investigates the wreck of a German submarine at the bottom of the Gulf of Mexico, just a few miles off New Orleans.
Researchers seek solutions to contain the rising acidity levels that are threatening the world's oceans.
NASA's New Horizons probe captures the first-ever detailed images of the icy world of Pluto.
The minute-by-minute story of the Fukushima Daiichi nuclear disaster, which resulted from the earthquake and tsunami, and its aftermath.
The discovery of ancient fossil human ancestors in South Africa.
Clues found on the ocean floor may clarify what happened to British explorer John Franklin and the 128 men who set off in two Royal Navy ships to chart the Northwest Passage in 1845, never to be heard from again.
A new version of the biblical flood story includes instructions for assembling an ark.
Cyber weapons have the ability to inflict physical damage on factories, power plants and pipelines.
Hi-tech images reveal the role of animal mummies in ancient Egyptian beliefs.
The shaping of North America, including palm trees that once thrived in Alaska and an eruption that nearly tore the Midwest in two.
The intertwined story of life and the landscape in North America -- from origins to dinosaurs and an ancient primate invasion.
From Ice Age to the oil boom, humans face challenges and uncover wealth hidden in North America's landscape.