The most data-dense demonstration sign I’ve ever seen. Tweeted by @PdeMenocal pic.twitter.com/ORj0I2hIGC — carlzimmer (@carlzimmer) September 21, 2014
The most data-dense demonstration sign I’ve ever seen. Tweeted by @PdeMenocal pic.twitter.com/ORj0I2hIGC
— carlzimmer (@carlzimmer) September 21, 2014