log-log slide rule

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Ahura Mazda - relief of the Zoroastrian god Ahura Mazda at the ancient ruins of Persepolis in Iran. Also known as Ormazd Zoroastrianism,

Which Religion Is the Oldest?

New York city skyline aerial with the Empire State Building, New York City, New York.

13 Iconic Buildings to Visit in New York City

World Data Locator Map: Australia

Is Australia an Island?

Close-up of ostriches (Struthio camelus) necks and heads; location unknown.

6 of the World's Most Dangerous Birds

King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

The Prado Museum facade at the Diego Velaszquez memorial. Established in 1819, the museum is considered the best collection of Spanish art and one of the world's finest collections of European art. Madrid, Spain

20 Paintings You Have to Visit at the Museo del Prado in Madrid

Image of jewish holiday Hanukkah with drawing menorah candles (traditional Candelabra), donuts and dreidels (spinning top) over chalkboard background. Chanukah.

Hanukkah, the Festival of Lights

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slide rule

''Log-log'' slide rule, obverse (top) and reverse (bottom).

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