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Why a falling pole can be held up: feedback, and the PID controller A pole on a cart wants to fall, and a controller that watches the lean and shoves the cart can hold it up. But how hard it pushes matters: too weak and it… Engineering4 min read Why you stumble naming the ink of a clashing colour word: the Stroop effect Name the ink colour of the word GREEN printed in red and you stumble, even though the rule is trivial. In 1935 John Ridley Stroop timed it: naming the ink of… Mind3 min read Why shared fish, fields and water get used up, and how some places don't When something is shared and nobody controls it, taking a bit more is always worth it for you. You keep the whole gain; the damage is split among everyone… Economics6 min read