Pediatrics

Getting kids moving and learning

Children are set to move more, improve their skills, and come up with their own creative tennis games with the launch of 'HomeCourtTennis', a new initiative to assist teachers and coaches with keeping kids active while at ...

Neuroscience

Babies retain even detailed events during a nap

The brain is permanently exposed to new impressions. Even when sleeping, it does not rest and processes recent experiences. In very early childhood, it has been thought that sleep primarily promotes semantic memory. This ...

Health

Have a ball with these exercises to strengthen your core

(HealthDay)—Pilates is an excellent exercise discipline that develops strength and agility, and you don't need to take formal classes or use Pilates machines to get its benefits. Using a stability ball with floor exercises ...

Sports medicine & Kinesiology

Running research: Heel-toe or toe-heel?

New research from La Trobe University suggests there is no evidence that changing a runner's strike pattern will help prevent injuries or give them a speed boost.

Neuroscience

How the brain regulates variability in motor functions

Anyone who has ever tried to serve a tennis ball or flip a pancake or even play a video game knows, it is hard to perform the same motion over and over again. But don't beat yourself up—errors resulting from variability ...

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Ball

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