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A stress ball in the shape of a globe. A stress ball or hand exercise ball is a malleable toy, usually not more than 7 centimetres (2.8 in) in diameter. It is squeezed in the hand and manipulated by the fingers, ostensibly to relieve stress and muscle tension or to exercise the muscles of the hand. Despite the name, many stress balls are not ...
This stress distribution is measured by using glass's natural property of stress-induced birefringence and by employing techniques of 3D photoelasticity. The high fracture toughness due to residual compressive stresses makes Prince Rupert's drops one of the earliest examples of toughened glass.
An average user should be able to start with a 45 mm (1.8 in) ball and move up to 60 mm (2.4 in) as their muscles get accustomed to the exercise. Larger Baoding balls between 70 mm and 100 mm (2.8 in to 3.9 in) can be used. Keeping larger balls separate while rotating them is an advanced skill.
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Later in 1985, Archie McPhee had started distributing the Obie design instead as The Popping Martian Doll, marketed as a stress toy and manufactured by a company named Aliko in Taiwan. [ 13 ] [ 14 ] By 1988 the name was changed to the Martian Popping Thing, and by 1991 was redesigned so that the mouth was a nose and the toy resembled a clown ...
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