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An El Cajon father cleaning his swimming pool was killed by a big rig that crashed through a fence and into his backyard.

Where is climate change currently happening on Earth, and what's causing those changes to occur? We speak to a physicist from the Jet Propulsion Laboratory about where major climate changes are taking place, and how climate modeling helps to predict future changes in our atmosphere.

The 2004 Nobel Prize in Physics is awarded to three Americans for their insights into the fundamental structures of matter -- the forces that bind together quarks. David Gross, David Politzer and Frank Wilczek showed how tiny quark particles interact, helping to explain how a coin spins -- and how the universe was built.

The Obama Administration has dramatically ramped up its use of drones as military and foreign policy tools. But many other countries want drones of their own, and advances in technology will soon allow for smaller, more powerful and cheaper models.

Up to 20 percent of soldiers who have fought in Iraq say they sustained a brain injury. Most with a severe brain injury never return to active duty. Army Spc. Freddy Meyers was shot in the head last May and initially could neither talk nor walk. Now he wants to go back to duty.

In Milwaukee, police say a mislabeled DNA sample made it possible for a suspected serial killer to avoid arrest for more than a decade. The error revealed a gaping hole in Wisconsin's DNA data bank and is spurring state officials to gather and verify thousands of DNA samples they thought were already in the system. In all, as many as 12,000 samples may be missing.

The failed Christmas Day attack on a U.S. airliner has triggered a new wave of scrutiny of the U.S. government's approach to aviation security. There are questions about whether the U.S. government is being aggressive enough in implementing other kinds of measures to detect suspicious passengers.

Rep. Keith Ellison, a Minnesota Democrat, is the first Muslim to serve in Congress. Earlier this month, Ellison undertook a sacred pilgrimage to Mecca, Saudi Arabia. The journey, known as the Hajj, is a pillar of the Islamic faith. The lawmaker shares highlights from his trip.

The Department of Agriculture introduces a new food pyramid that incorporates a symbol for physical activity. The nutritional guidelines, accompanied by a Web site offering tailored recommendations, are aimed at changing American lifestyles.

How much of our daily lives are being videotaped? The ubiquity of surveillance cameras is one of the themes in David Bajo's new novel "Panopticon" set on the border between San Diego and Mexico.