Food writer Michael Pollan once advised "Eat food. Not too much. Mostly plants." Now, he tells us how to cook it. In his new book Cooked: A Natural History of Transformation, he takes a tour of the most time-tested cooking techniques, from southern whole-hog barbecue and slow-cooked ragus to sourdough baking and pickle making.
These robotic flies, which were built in a Harvard lab, can flap their wings independently of each other and fly around while tethered to a power and control wire.
Credit Kevin Ma, Pakpong Chirarattananon / AAAS/Science
An insect's eye lets it see really well because each of its light-sensitive cells has a dedicated lens. This miniature camera, which mimics an insect eye, is made from an array of microlenses arranged on a stretchable sheet that can be inflated like a balloon to a hemispherical shape.
Credit University of Illinois and Beckman Institute
A smartphone can tell you where to get a cup of coffee, but it can't go get the coffee for you. Engineers would like to build little machines that can do stuff. They would be useful for a lot more than coffee, if we could figure out how to make them work.
But the rules of mechanics change at small scales. Friction becomes dominant; turbulence can upend a small airplane.