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Pappus of Alexandria

Nothing is known of his life, other than what can be found in his own writings: that he had a son named Hermodorus, and was a teacher in Alexandria. Collectionhis best-known work, is a compendium of mathematics in eight volumes, the bulk of which survives. It covers a wide range of topics, including geometryrecreational mathematicsdoubling the cubepolygons and polyhedra. Pappus was active in the 4th century AD.

Stephen sisman

Historical records and family trees related to Henry Sisman. Records may include photos, original documents, family history, relatives, specific dates, locations and full names. Trusted by millions of genealogists since Trusted information source for millions of people worldwide.

Crystal radio kits

Before the s and the dawn of television, people would gather in their homes with family and friends around the radio-just as we do with our TVs today-to listen to sports, music, news, and entertainment programs. Then, as now, the radio acted as a gateway to the world.

New water heater sounds like a tea kettle

It's not uncommon for your water heater to be making noises, and besides the fact that it's just down right annoying, it could be an indication that there's something wrong with your heater that needs to be corrected. Even if you perform regular maintenance on your heater, you could still experience a noisy water heater. Taking the time to diagnose the problem will not only quiet things down, but it could help you prevent further damage. This article covers the top 7 reasons you may be experiencing a noisy water heater.