Jetlag. What is it? How can you lessen its effects? Dr. Vernon Williams, Director of the Center for Sports Neurology & Pain Medicine at Cedars-Sinai's Kerlan-Jobe Institute, and Captain Laura Einsetler explain.

10,000 steps a day. Where did that number come from? Do we really need that many? Dr. Thomas Hirai, director at the bariatric and metabolic health center at O'Connor Hospital in San Jose, and Dr. Fatima Cody Stanford with Massachusetts General Hospital and Harvard Medical School, settle the score on steps.

Idioms. Where do common phrases like "nose to the grindstone" and "hold your horses" come from? Jaye Padgett, Linguistics Professor at UC Santa Cruz, traces their histories.

Got questions? Email Mike at [email protected]