Part 1: "Nightline" goes across the country to embed with police and trauma rooms.


...

Read more: Watch: A Day in the Life of the American Gun

Part 2: The Laveres taught their two young children how to shoot at an early age.


...

Read more: Watch: For Utah Family, Guns Are a Revered Family Tradition

Part 3: Police officers and gunshot victims offer their thoughts on the future of gun control.


...

Read more: Watch: Guns in America: What Should Be Done

The chemical structure of part of a young child's DNA, or genetic blueprint, is physically changed by bullying, leaving the victim less able to respond properly to the stress, according to a study of English children.


...

Read more: Bullying Changes Kids' DNA in Study

Three Hollywood stars have come bearing gifts to help troubled starlet.


...

Read more: Lindsay Lohan's Three Wise Men

No offense to the Mayans, but I'm putting my money on the planet still being here next year. But let's not dismiss this end-of-the-world business just yet. Suppose you knew for certain that the apocalypse was imminent and set to occur, say, a year from now, on December 21, 2013. With only 12 months left of humanity, how would you spend your time? And what would you do about work?


...

Read more: 8 Career Tips for the Apocalypse

Whether you're luxuriating in first class or crammed into coach, cruising above 30,000 feet for four-plus hours affects your health.


...

Read more: Health Effects of a Long Flight

Two protective fathers donned their uniforms -- one military, one police -- for off-duty appearances as they accompanied children to school and stood guard outside to help them feel safe.


...

Read more: Uniformed Dads Stand Guard at Kids' Schools

The list of missed doomsday predictions seems destined to keep growing.


...

Read more: Missed Doomsday Predictions

...

Read more: Fiscal Cliff 'Plan B' Is Dead: Now What?