Tuesday, Apr. 15, 2008 | The Kojo Nnamdi Show

A year after the tragic shootings at Virginia Tech, colleges and universities are looking for new hi-tech solutions for boosting security and broadcast alerts during campus emergencies. We look at the lessons learned from last year's...

From the laws of motion to the circulation of blood to the calculations of a quantum computer, we look behind some of the world's most impressive technological and scientific discoveries.

In many homes, the kitchen is more than just a place to cook. It's a dining room, a study, an office and a den, all in one room -- a place that brings a family together. But this wasn't always so. In the early 20th century, most kitchens...