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Drinking water or potable water is water that is safe for ingestion, either when drunk directly in liquid form or consumed indirectly through food preparation. It is often (but not always) supplied through taps, in which case it is also called tap water. Typically in developed countries, tap water meets drinking water quality standards, even ...
The Chernobyl disaster [a] began on 26 April 1986 with the explosion of the No. 4 reactor of the Chernobyl Nuclear Power Plant near the city of Pripyat in the north of the Ukrainian SSR, close to the border with the Byelorussian SSR, in the Soviet Union. [1] It is one of only two nuclear energy accidents rated at seven—the maximum severity ...
The Antikythera mechanism ( / ˌæntɪˈkɪθɪərə / AN-tih-KIH-ther-ə) is an Ancient Greek hand-powered orrery (model of the Solar System), described as the oldest known example of an analogue computer [1] [2] [3] used to predict astronomical positions and eclipses decades in advance. [4] [5] [6] It could also be used to track the four-year ...
The Comstar wheel, sometimes referred to as Com-stars or stylised as ComStar, [1] [2] was a composite motorcycle wheel that Honda fitted to many of its motorcycles from 1977 [3] [4] to the mid 1980s. Its design allowed it the option of being fitted with tubeless tyres and its use on the Honda CX500 was the first time tubeless tyres had been ...
Steering knuckle. In automotive suspension, a steering knuckle or upright is that part which contains the wheel hub or spindle, and attaches to the suspension and steering components. [1] The terms spindle and hub are sometimes used interchangeably with steering knuckle, but refer to different parts. The wheel and tire assembly attach to the ...
Poncelet wheel. The Poncelet wheel is a type of waterwheel invented by Jean-Victor Poncelet while working at the École d'Application in Metz. It roughly doubled the efficiency of existing undershot waterwheels through a series of detail improvements. The first Poncelet wheel was constructed in 1838, and the design quickly became common in France.
Cats are common pets throughout the world, and their worldwide population as of 2007 exceeded 500 million. [199] As of 2017, the domestic cat was the second most popular pet in the United States, with 95.6 million cats owned [200] [201] and around 42 million households owning at least one cat. [202]
Climate change threatens people with increased flooding, extreme heat, increased food and water scarcity, more disease, and economic loss. Human migration and conflict can also be a result. [12] The World Health Organization (WHO) calls climate change the greatest threat to global health in the 21st century. [13]