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The "rough" nature of a Super Ball makes its impact characteristics different from those of otherwise similar smooth balls. [23] [24] The resulting behavior is quite complex. [24] The Super Ball has been used as an illustration of the principle of time reversal invariance. [25] A Super Ball is observed to reverse the direction of spin on each ...
Glow sticks were originally invented by the US Military, [15] and are an essential part of military operations across land and sea, where they are more often referred to as chem lights. Glow sticks are also used within police tactical units, as light sources during night operations or close-quarters combat in dark areas. They are also used to ...
[1] [2] Each ball measures 4 inches (10 cm) in diameter [3] and contains a mix of helium [4] [5] and compressed air. It has received critical acclaim for its high restitution , or bounciness. [ 1 ] The Skyball is often compared to the popular 1965 Wham-O Superball , [ 6 ] with the Skyball being advertised as bouncing 75 feet (23 m), "higher ...
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Those differ significantly from the actual "M-80" as they are subject to the regulations with regard to the sale of explosives and fireworks to the general public. [12] These firecrackers most commonly have a small capsule with up to 50 milligrams of powder (30 milligrams is most common), in contrast with the 5200 milligrams (5.2 g) that real M ...