- Only full-grown male crickets can chirp.
- Only male canaries can sing.
- Only one person in two billion will live to be 116 or older
- Only one western film has even been directed by a woman.
- Only the male nightingale sings.
- Oophorectomy is the surgical removal of the ovaries.
- Opium was used widely as a painkiller during the American Civil War. As a result, over one hundred thousand soldiers had become drug addicts by the end of the war.
- Oranges cease to ripen after picking.
- Oranges, lemons, watermelons, and tomatoes are berries.
- Orchids have the smallest seeds. It takes more than 1.25 million seeds to weigh 1 gram.
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