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.
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For our annual How It Works issue, we break down everything from the massive Falcon Heavy rocket to a tiny DNA sequencer that connects to a USB port. We also take a look at an ambitious plan for faster-than-light travel and dive into the billion-dollar science of dog food.
Plus the latest Legos, Cadillac's plug-in hybrid, a tractor built for the apocalypse, and more.

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