7 asteroid impacts on Earth
November 25, 2012, 12:07 p.m. by Katherine Butler
Life on Earth has been heavily shaped by impact events. Not only have they shaped evolution, they have created important ore deposits and land disturbances. Here are seven images of known asteroid impact craters on our planet.
The worst everyday air pollutants -- and what they do to our bodies
October 18, 2012, 11:12 a.m. by Katherine Butler
Here's how some of the most common air pollutants are created and the effect they have on our bodies.
'Howard's Gift' is inspired advice for a fulfilling career
October 11, 2012, 10:05 a.m. by Katherine Butler
We talk to author Eric Sinoway about 'Howard’s Gift: Uncommon Wisdom to Inspire Your Life’s Work,' his new book about achieving personal fulfillment in your life's work.