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A home assembled amplifier featured as the cover illustration of the magazine Electronics World, September 1959, Volume 62 Number 3.

Chinampas are human-made islands built in shallow lakebeds that have fed the people of Mesoamerica and shaped local ecosystems for over a thousand years. Sometimes referred to as 'floating gardens,'...

Henry Hudson (c. 1570-1611) was an English navigator and maritime explorer. He is known for his four voyages between 1607 and 1610 in search of a northwest passage via the Arctic Ocean to the Far East. The lure of a northwest passage...

Ibn Battuta (l. 1304-1368/69) was a Moroccan explorer from Tangier whose expeditions took him further than any other traveler of his time and resulted in his famous work, The Rihla of Ibn Battuta. Scholar Douglas Bullis notes that...

Moses (c. 1400 BCE) is considered one of the most important religious leaders in world history. He is claimed by the religions of Judaism, Christianity, Islam, and Bahai as an important prophet of God and the founder of monotheistic belief...

Thomas Paine (1737-1809) was an Anglo-American Enlightenment thinker whose radical ideas were taken up by revolutionaries in both the American Revolution (1765-1783) and the French Revolution (1789-1799). A Founding Father through...

Robert Boyle (1627-1691) was an Anglo-Irish chemist, physicist, and experimental philosopher. Boyle was a prolific author, made significant experiments with air pumps, and presented the first litmus test. A founding member of the...

The germ theory, which emerged in the late 19th century, demonstrated that microscopic germs caused most human infectious diseases. The germs involved included bacteria, viruses, fungi, protozoa, and prions. Louis Pasteur (1822-1895...

Antonie van Leeuwenhoek (1632-1723) was the most important microscopist of the Scientific Revolution. The Dutchman made over 500 microscopes, many with a magnification far superior to contemporary models. His discoveries...

Washington Irving (1783-1859) was an American author, essayist, and diplomat best known for his short stories The Legend of Sleepy Hollow and Rip Van Winkle. He was the first professional American author and also the first to...