Topic: David Lawrence

NASA's Messenger probe reveals new clues about Mercury

Mercury, the oddest of the rocky planets, has been little understood by scientists. But on a swing by the planet, NASA's Messenger sent back intriguing data about Mercury's surface minerals and volcanic activity.

At the G-20: Pittsburgh, the former 'Steel City,' has chance to shine

Pittsburgh will show a green, high-tech face to its G-20 guests.

G20 summit: three big agenda items for world leaders

Topping the G-20 'to do' list is to settle on any additional economic stimulus – and whether to rein in banker bonuses. Global warming is on the table, too.

Now you see it, now you don't (nearly as much)

Arctic sea ice melting faster than expected

If the pattern continues, warming effects could reach up to 900 miles inland, melting permafrost