Aristotle
Socrates
Eratosthenes
Aristarchus
Eratosthenes.
Eratosthenes used geometry, trigonometry, and a well in Alexandria, Egypt, to calculate the earth's diameter.
Quartzite. Quartzite is the metamorphic equivalent of sandstone.
Smoke. Much of the smoke in smog comes from the industrial burning of coal.
Cashew. Cashews, which are native to Brazil, were carried to India around 1560, then spread to Asia and Africa.
Sonar. "Passive sonar" is listening to the underwater sounds made by vehicles.
Saltwater Crocodile. The Saltwater Crocodile is the largest reptile in the world.
1,350,000 M.P.H.. The Milky Way contains roughly one-hundred billion stars.
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