Three weeks after 17-year-old Trayvon Martin was shot and killed by neighborhood watch volunteer George Zimmerman, no arrests have been made in what critics are calling a case of racial profiling. Columnist Leonard Pitts says the incident exposes society's "blindness" to African-Americans.
Former Rutgers student Dharun Ravi could face 10 years in prison and deportation to his native India after being convicted of bias intimidation. Ravi used a webcam to spy on his roommate, Tyler Clementi, having an intimate encounter with another man. Clementi killed himself several days later.
Business and political leaders have repeatedly warned that America's scientists and engineers are in short supply. However, some economists say the numbers indicate the opposite — a glut of high-tech workers. A panel of experts debate whether America's schools produce the scientific workforce needed to compete globally.
The world's tallest peak. It's so iconic. It's so classic. You'd think we'd have learned everything there is to know about it by now, but you'd be wrong. Scientists still can't even agree on the exact height of the mountain. And what's more, they're not even sure what kind of rocks the mountaintop is made of.
Astrophysicist Adam Riess shared the Nobel Prize in Physics in 2011 for his work on distant supernovae, which demonstrated that the universe was not only expanding--but that its expansion was accelerating. Now he's hunting for clues that might explain why, and one of the prime suspects is a mysterious force known as dark energy.