From Twitter https://twitter.com/drsekula:

RT @AMNH: Notable for their simplicity, some of Darwin's experiments are good science lessons for kids http://www.amnh.org/explore/news-blogs/news-posts/how-to-experiment-like-darwin?utm_source=social-media&utm_medium=twitter&utm_term=20151113-fri&utm_campaign=darwin https://twitter.com/AMNH/status/665251656565710848/photo/1 https://chirp.cooleysekula.net/attachment/4099