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Height can be a clue to the health of a person and a population. The U.S. once had the tallest population in the world, but recent studies show northern Europeans are now on top.

In Afghanistan, Lt. Col. Jason Morris led the 3rd Battalion, 5th Regiment, which suffered the highest casualty rate of any Marine unit during the past 10 years of war. The "Darkhorse Battalion" commander says the unit's mission was a success — but he will live with the burden of those deaths.

Ronald McNair was one of the astronauts killed 25 years ago on Jan. 28, when the space shuttle Challenger exploded. As his brother recalls, McNair's life was all about exploring boundaries — and exceeding them.

What's the gang world like in America's Finest City? For several months, KPBS reporter Ana Tintocalis has been compiling a series of reports that she calls San Diego Gang Stories. It explains local gangs through the eyes of the people who come in contact with them. For the next hour, we'll bring you a special report that incorporates this series of Gang Stories.

How to Deal With PTSD After Leaving The Military

Learn more about plans to burn down the home of a 54-year-old Escondido man accused of having a bomb factory in his house.

Some of the 250,000 U.S. diplomatic cables disclosed by WikiLeaks were about mental health, gastrointestinal problems and a mysterious tumor. Written by American diplomats about Latin American leaders, the messages have a region up in arms.

Responding to tightened sanctions and a new United Nations Security Council resolution condemning their December rocket launch, North Korea has threatened a new nuclear test, explicitly warning that the North Korean weapons program will target the United States.

A new book combines the memories and culinary skills of one Chinese political dissident who lived through the country's Cultural Revolution. Since food was rationed, Sasha Gong learned to cook with whatever she could find. "There's something about humanity," she says. "It's hard to suppress."

Americans John Mather and George Smoot (left) have won the 2006 Nobel Prize for Physics. Their work on cosmic radiation helped pinpoint the age of the universe and added weight to the big-bang theory, which holds that the universe was created 13 billion years ago in an unparalleled explosion.