Dr. Philip S. Callahan is a philosopher as well as a top-grade scientist. He is also an explorer who has walked across mainland China and the Syrian Desert, obs

This exercise routine hosted by professional dancer and fitness expert Barbi Powers leads viewers through a complete ballet and classical dance inspired workout

Over the last forty years, scientists have uncovered evidence that if the Universe had been forged with even slightly different properties, life as we know it -

The soundscape--a term coined by the author--is our sonic environment, the ever-present array of noises with which we all live. Beginning with the primordial so