The Summer Olympic Games feature throwing events, such as shot put, hammer throw and discus. One training tool used by these athletes is throwing different mass implements to improve competitive performance, but the method ...
Jul 23, 2024
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The world's best golfers make playing look so effortless, it's hard to imagine what's going on inside their minds. But modern neuroscience allows us to do exactly that. My team's new study shows how different parts of an ...
Jul 22, 2024
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Parasomnia—it's a blanket term for pesky behaviors that wreak havoc on your sleep. A third of U.S. adults get less than the recommended amount of shut-eye, a nationwide struggle linked to chronic diseases ranging from depression ...
May 11, 2024
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Hydronephrosis is a common congenital anomaly that is increasingly identified during prenatal ultrasound. Although ultrasound is also the first-line test to screen for hydronephrosis in infants, it is poor at determining ...
Apr 5, 2024
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Tiny, powerful magnetic balls sold exclusively online at Walmart as building blocks and stress relievers have been recalled for swallowing dangers, the U.S. Consumer Products Safety Commission (CPSC) said Thursday.
Dec 29, 2023
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It's well-known that playing football and soccer can cause concussions and other head injuries. But how fast would a tennis ball need to be traveling to possibly cause traumatic brain injury?
Dec 6, 2023
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Candy Dynamics Inc. said Thursday it is recalling 70 million of its candies because they can pose a choking hazard.
Oct 5, 2023
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When the human head experiences any kind of movement—from nodding yes or no to heading a soccer ball or being jolted in a car crash—the brain moves inside the skull, leading to deformation of the tissue. Such deformations ...
Jul 27, 2023
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While the U.S. women's national soccer team competes in the FIFA Women's World Cup in Australia and New Zealand, many amateur players may be inspired to kick up the soccer ball at home. A Baylor College of Medicine athletic ...
Jul 26, 2023
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An informal personal caregiver is someone who looks after a family member, neighbor or friend in need of care due to disability, illness or age.
May 30, 2023
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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
