Tree rings tie geology, astronomy, and ecology into a concentric narrative. Tracing the arc can predict the future. http://ow.ly/Rn8aZ
1:02 PM - 26 Aug 2015
0 replies
10 retweets
3 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.