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

	Marathon Challenge Explore what it takes—physically and mentally—for novice runners to make it through a classic test of endurance.

	MARS Dead or Alive NASA gambles on two rovers sent to determine if the red planet ever had conditions suitable for life.

	Master of the Killer Ants The Mofu people of Cameroon rely on an unlikely ally—a driver ant—to protect their homes and crops.

	Megabeasts' Sudden Death Scientists propose a radical new idea of what killed off mammoths and other large animals at the end of the Ice Age.

	Methuselah Tree NOVA examines the fascinating life cycle of the world's oldest living thing, a 4,600-year-old bristlecone pine in California's White Mountains.

	Missing in MiG Alley What happened to American pilots shot down over Korea half a century ago?

	Missing Link, The Paleontologists studying the Devonian Period (408-360 million years ago) discover a tiny fossil of colossal importance.

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

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

	Mountain of Ice Jon Krakauer and fellow mountaineers pioneer a new route on a scientific expedition up Antarctica's highest peak.

	Mummy Who Would be King, The Could a mummy exhibited for 140 years at an obscure museum in Niagara Falls be the remains of a long-lost Egyptian pharaoh?

	Musical Minds Oliver Sacks explores how the power of music can make the brain come alive.

	Mysteries of the Nile Explore ancient Egypt through a stunning series of interactive panoramic photographs.

	Mysterious Life of Caves Toxic caverns teeming with strange life-forms spark a radical theory of how caves take shape.

	Mysterious Mummies of China Three-thousand-year-old mummies with long blond hair and blue eyes are unearthed in a remote Chinese desert.

	Mystery of the First Americans The discovery of a 9,000-year-old skeleton embroils scientists in a debate over North America's first inhabitants.

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

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