The Annotated Pratchett File, v7a - The L-Space Web

Amongst English (and Australian) children there exists the folk-belief that the seed-heads of dandelions can be used to tell the time. The method goes as follows: pick the dandelion, blow the seeds away, and the number of puffs it takes to get rid of all the seeds is the time, e.g. three puffs = three o’clock. ................
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