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How do magnets work?

The etymology of the word magnet likely comes from naturally occurring lodestones (naturally occurring mineral deposits with magnetic properties) found by the ancient Greeks around the city of Magnesia. Likely thought of as witchcraft at the time, we now know that magnetism itself is due to unpaired electrons at a sub atomic level.

Arapaima fishing in Brazil (18 pictures)

Catching the Arapaima, a fish that is sought after for its meat, is only allowed once a year by Brazil’s environmental protection agency. The minimum size allowed for a fisherman to keep an Arapaima is 1.5 meters.

10 Nations With Most Slaves

It is almost impossible to imagine, but nearly 30 million people around the world are slaves. Slavery is today and has always been—one person controlling another and then forcing them to work.