http://www.kqed.org/.stream/anon/radio/quest/2011/02/2011-02-28-quest.mp3
It's been a harsh winter across the US. Snow has blanketed the Sierra Nevada, where the snowpack is well above normal. Lots of snow means good skiing, but it also means an increased danger of avalanches. Lauren Sommer travels to Lake Tahoe where researchers are trying to understand the inner workings of snow a little bit better.