Teens tackle 21st-century challenges at robotics contest
For their first trip to a celebrated robotics contest for high school students from scores of countries, a team of Ukrainian teens had a problem.
Oct 16, 2022
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For their first trip to a celebrated robotics contest for high school students from scores of countries, a team of Ukrainian teens had a problem.
Oct 16, 2022
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United Airlines said Wednesday it plans to add up to 28 daily flights to Florida this winter, but the airline is prepared to reverse course if the rate of coronavirus cases in the state remains high.
Aug 13, 2020
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No crystal ball is needed to envision a future that engineers have in mind, one in which air taxis and other flying vehicles ferry passengers between urban locations, avoiding the growing gridlock on the ground below. Companies ...
Apr 24, 2024
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A ball is a round, usually spherical but sometimes ovoid, object with various uses. It is used in ball games, where the play of the game follows the state of the ball as it is hit, kicked or thrown by players. Balls can also be used for simpler activities, such as catch, marbles and juggling. Balls made from hard-wearing materials are used in engineering applications to provide very low friction bearings, known as ball bearings. Black powder weapons use stone and metal balls as projectiles.
Although many types of balls are today made from rubber, this form was unknown outside the Americas until after the voyages of Columbus. The Spanish were the first Europeans to see bouncing rubber balls (albeit solid and not inflated) which were employed most notably in the Mesoamerican ballgame. Balls used in various sports in other parts of the world prior to Columbus were made from other materials such as animal bladders or skins, stuffed with various materials.
As balls are one of the most familiar spherical objects to humans, the word "ball" is used to refer to, or to describe, anything spherical or near-spherical.
This text uses material from Wikipedia, licensed under CC BY-SA