Did you solve it? Do you think like a physicist?

Science | The GuardianMonday, July 20, 2026Jul 20

In brief

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“The answer to today’s puzzle Earlier today I set you a puzzle about keeping homes cool in a heatwave. Here it is again with the solution. Imagine a room with a set of curtains. When the Sun is shining, its energy comes through the windows w”
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Did you solve it? Do you think like a physicist?

In brief

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