A few facts from my sigs file:
The universal gravity constant G is 6.67E-11 to three significant figures. Taking this and the distance of the sun from the earth into account you are about 100g heavier at night than at midday.
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There is a genus of snails called “Abra” and when a new species was discovered, some wag named it “Cadabra”, so its full scientific name is Abra Cadabra.
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The 71m packets of biscuits sold annually by United Biscuits, owner of McVitie’s, generate 127.8 tonnes of crumbs.