Search results
Results from the WOW.Com Content Network
In 538, the Roman statesman Cassiodorus described the following to one of his subordinates in letter 25: [7] The sun's rays were weak, and they appeared a "bluish" colour. At noon, no shadows from people were visible on the ground. The heat from the sun was feeble. The moon, even when full, was "empty of splendour"
An 1831 color lithograph by Robert Seymour depicts cholera as a robed, skeletal creature emanating a deadly black cloud.. The miasma theory (also called the miasmic theory) is an abandoned medical theory that held that diseases—such as cholera, chlamydia, or the Black Death—were caused by a miasma (μίασμα, Ancient Greek for 'pollution'), a noxious form of "bad air", also known as ...
Hydrogen fluoride and sulfur dioxide emissions from U.S. Steel's Donora Zinc Works and its American Steel & Wire plant were frequent occurrences in Donora. What made the 1948 event more severe was a temperature inversion, a situation in which warmer air aloft traps pollution in a layer of colder air near the surface.
He wears a purple harness. In the two episodes, Alfred and his best friends Camille and Milo ride on his back. Near the end of "The False Notes in Gnarly Woods", he gives them his antlers in order to make new flutes. Withers is a feral brown bear that lives near the lake of Gnarly Woods. He appears as a solved mystery in "The Phantom Footprints".
The Great Smog of London, or Great Smog of 1952, was a severe air pollution event that affected London, England, in December 1952.A period of unusually cold weather, combined with an anticyclone and windless conditions, collected airborne pollutants—mostly arising from the use of coal—to form a thick layer of smog over the city.
The rating, developed by the American Society of Heating, Refrigerating and Air Conditioning Engineers, reports a filter’s ability to capture larger participles between 0.3 and 10 microns.
The third plague pandemic (1855–1859) started in China in the mid-19th century, spreading to all inhabited continents and killing 10 million people in India alone. [181] The investigation of the pathogen that caused the 19th-century plague was begun by teams of scientists who visited Hong Kong in 1894, among whom was the French-Swiss ...
History is part of the school curriculum in most countries. [197] Early history education aims to make students interested in the past and familiarize them with fundamental concepts of historical thought. By fostering a basic historical awareness, it seeks to instil a sense of identity by helping them understand their cultural roots. [198]