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Did you know? That the Roman flour mill complex at Barbegal in southern France employed 16 water wheels arranged in two rows of 8, and was powered by its own purpose-build aqueduct?

Did you know? That the elements Technetium (43) and Promethium (61) are the only radioactive elements on the periodic table that are surrounded on both sides by stable ones.

Did you know? That there are over 350 proofs of the Pythagorean theorem and that knowledge of the theorem predates Pythagoras (c. 6th century BCE) by at least one thousand years.

Did you know? The Periplus of the Erythraean Sea (Περίπλους της Ερυθράς Θαλάσσης) was a book written in the first century CE describing trade routes and geography from the Red Sea down the east coast of Africa and out to the west coast of India.

Did you know? In 1990 the number of extrasolar planets discovered beyond our Solar System was 0. Now the number is over 4000!

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