Add Yahoo as a preferred source to see more of our stories on Google. A Polar vortex has covered the Philadelphia region under a canopy of frigid temperatures, but many people may not realize what a ...

The extreme light environment of the Earth's polar regions fosters unique conditions that could play a crucial role in maintaining global biodiversity over time, a new study by Finnish researchers ...

Add Yahoo as a preferred source to see more of our stories on Google. The first of what is expected to be three December Polar vortex waves has blanketed the Philadelphia region with frigid ...

Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF. Visit NAP.edu/10766 to get more information about this ...