(CNN) — Archaeologists have unearthed the oldest known wooden structure, and it’s almost half a million years old. The simple structure — found along a riverbank in Zambia — is made up of two ...

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“Plop plop, fizz fizz, oh what a relief it is.” You might have thought that only the pill that goes with that jingle creates relief. But science suggests the jingle’s wording itself elicits relief.