RT @rob_carlson: Old scientists. https://t.co/faZPcrmazH @NatureNews https://t.co/OUVNj0ng3S

Old scientists.https://t.co/faZPcrmazH @NatureNews http://pic.twitter.com/OUVNj0ng3S

— Rob Carlson (@rob_carlson) September 5, 2016

from Twitter https://twitter.com/DouglasHAllen