I shouldn't have given all the props to chicks for being able to count. Turns out mosquitofish -- freshwater fish found in north and central America -- can count as well, and the test they passed to indicate this reminds me of the scene in Labyrinth where Sarah has to determine which door to enter.
Also in today's links: how to grind rock without damaging your teeth, a fond memory for all former Odyssey-of-the-Minders, and more.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.