Every year Alaska has about 5,000 earthquakes, 1,000 of which measure above 3.5 on the Richter scale.

The Romans used to clean themselves with olive oil since they did not have any soap. They would pour the oil on their bodies, and then use a strigil, which is type of blade, to scrape off any dirt along with the oil.

Plutonium - first weighed on August 20th, 1942, by University of Chicago scientists Glenn Seaborg and his colleagues - was the first man-made element.

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