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50. Giant Ancient Fish Fed Like Whales: These filter-feeders thrived for more than 100 million years.
49. Why Swine Flu Fizzled: H1N1 changed as it spread--but we may not have seen the last of it.
48. The Science of Chivalry: Studies of the Titanic and Lusitania shipwrecks shed light on "women and children first."
47. An Early Dawn for Earth's Complex Life: Did multicellular organisms get their start 2.1 billion years ago?
46. Do Physical Laws Vary From Place to Place? A surprising finding casts doubt on our understanding of the constants of nature.
45. The Pinkie Pokes Holes in Human Evolution: Even the littlest bone can change the story of human origins.
44. A Prehistoric Moby-Dick: Meet Livyatan Melvillei, a toothy 12-million-year-old sperm whale.
43. Plasma Rivers Explain the Quiet Sun: Researchers have been looking for an explanation for a recent lull in sunspots and flares.
42. X Prize Shows the Easy Path to a 100-MPG Car: It doesn't require wild new technology to reach super-efficiency.
41. Scans Unlock Hidden Life in Vegetative Brains (pictured): A man believed to be in a vegetative state communicates with doctors using only his thoughts.