How did the planet cool 40 million years ago without spiraling into an ice age? Research looks at Earth's thermostat: http://stanford.io/1kMKbq9
2:45 PM - 20 Mar 2014
0 replies
5 retweets
6 likes
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.