Search Results: Quantum gravity

Aqueducts transport water from one place to another, achieving a regular and controlled supply to a place that would not otherwise receive sufficient quantities. Consequently, aqueducts met basic needs from antiquity onwards such as the irrigation...

Johannes Kepler (1571-1630) was a German astronomer and mathematician most famous for creating what was up to that point the most accurate model of planetary astronomy with his three laws of planetary motion. Kepler was the first to present...

Gold, chemical symbol Au (from the Latin aurum meaning 'shining dawn'), is a precious metal which has been used since antiquity in the production of jewellery, coinage, sculpture, vessels and as a decoration for buildings, monuments and statues...

The qanat (called foggara in North Africa and the Levant, falaj in the United Arab Emirates and Oman, kariz in Iran, and puquios in Peru) is an ancient Middle Eastern irrigation technique in which a long tunnel is dug into arid land that...

Edmond Halley (1656-1742) was an English astronomer, mathematician, and cartographer. Halley's Comet is named after him since he accurately predicted its return in 1758. One of the early globetrotting scientists, Halley led several maritime...

Red Cloud (Makhpiya-luta, l. 1822-1909) was an Oglala Lakota Sioux chief, statesman, and military strategist who became the only Native American leader of the Plains Indians to win a war against the United States. Red Cloud's War (1866-1868...

Greek pottery has four main types: Geometric, Corinthian, Athenian Black-figure, and Athenian red-figure pottery. Pottery vessels were made for everyday use such as the two-handled amphora for storage, the single-stem kylix cup for drinking...

The Enlightenment (Age of Reason) was a revolution in thought in Europe and North America from the late 17th century to the late 18th century. The Enlightenment involved new approaches in philosophy, science, and politics. Above all, the...

People in the Middle Ages have acquired something of a bad reputation when it comes to cleanliness, especially the peasantry. However, despite the general lack of running water and other modern amenities, there were common expectations of...

The steam engine developed by the Scotsman James Watt (1736-1819) from 1769 was much more efficient in terms of power and fuel consumption than earlier models, and it significantly increased the possible uses for this key invention of the...