Think about how you'd search a large room for a lost key. You wouldn't examine every square inch sequentially. You'd split the room into sections (by the couch, near the door, under the table) and rule out entire sections at a glance. "I didn't go near the kitchen, so skip that."
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Over 9,300 miles away, on Mombasa Road in Nairobi, grey mirrored glass glints through the traffic dust.
Equal (0): Everything in this space must be equal to 0. The answer is 1-0, placed vertically; 0-3, placed horizontally.
"The Dutch are rich and they work less – but the question is, how sustainable is this?" says Nicolas Gonne, economist at the OECD. "There's only so much you can do with few workers.