Scientists have long debated one of the greatest mysteries of science: What caused the mass extinction of mammoths around 13,000 years ago? A look at science in the making, National Geographic follows a team as they assemble one theory for what might have happened to the mammoths, which reigned over the landscapes of North America for more than 1 million years. Could the clues point to the biggest cosmic impact humans have ever witnessed?
Heroin is one of the most addictive drugs on earth. Stronger, purer and easier to get than ever before. The newest forms of heroin can be snorted or smoked--rather than injected--attracting millions of new users. National Geographic investigates how the war in Afghanistan has inadvertently unleashed a deluge of heroin, feeding addicts from Kabul to Europe to America's heartland.
National Geographic gets to the science behind what makes a man manly -- his Testosterone Factor. It's one of the most important and powerful hormones in a man's body, but how does it really impact the men in your life? Explorer presents the latest insights from leading researchers in psychology, biology and anthropology to reveal testosterone's fascinating influence on strength, status, success and even commitment.
Nowhere is the battle to find oil more intense than in Alaska - source of nearly 15% of America's domestic production, and home to the nation's largest wildlife preserve, the Arctic National Wildlife Refuge, where companies are pushing to drill. National Geographic travels back millions of years to see how oil was created, and looks to the future to ask how far we'll go to find every last barrel and at what cost.
When engineers started building the deepest submerged tunnel in the world, along the worst fault line on the planet, they knew this would be a tough project. But the greatest challenge doesn't lie in the future, it lay in the past.
On Christmas Day 2007, a 243-pound Siberian tiger named Tatiana escaped from her open-air enclosure at the San Francisco Zoo and mauled three young men. Before long, one 17-year-old boy and the 4-year-old tigress lay dead. Zoo Tiger Escape investigates the how and why of what really happened that night-from the possible motivational factors that led the tiger to escape, to the complex evolution of enclosure design.