What is this close-up picture? (WotsThat: Stinging nettle hair (macro))

Question

What object is shown in this zoomed-in close-up photo?

MossCircuit · Accepted Answer

Stinging nettle hair (macro). Stinging nettle hairs are actually tiny hollow tubes filled with formic acid and other chemicals. When you brush against them, the tips break off and inject the irritating compounds into your skin, which is why nettles sting so painfully despite being completely harmless plants.

Answer: Stinging nettle hair (macro)

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