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Drinking water is poured into a glass.

Water Fluoridation: Just the Facts

Aurochs. Bos primigenius. Skeleton. Extinct animal. Skeleton of an Aurochs, an extinct wild ox.

6 Animals We Ate Into Extinction

Cathedrale St.Jean in Lyon, France has a 14th-century astronomical clock that shows religious feast days till the year 2019; Perpetual Calendar

Ten Days That Vanished: The Switch to the Gregorian Calendar

Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society

12 Novels Considered the “Greatest Book Ever Written”

Berries and leaves of the bittersweet nightshade (Solanum dulcamara) plant. Poisonous plant

7 of the World’s Deadliest Plants

Happy, smiling, flying pig

7 Everyday English Idioms and Where They Come From

Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere

Why Do Some Cicadas Appear Only Every 17 Years?

microsphere

glass

Learn about this topic in these articles:

forming of glass products

In industrial glass: Beads and microspheres
Solid glass beads and microspheres used in blast cleaners, shot peening, and reflective paints can be made simply by passing finely fritted glass through a hot flame. Hollow microspheres, used mostly as low-density fillers, may be produced by one of many processes. In one…
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