Spasticity is a condition in which certain muscles are continuously contracted. This contraction causes stiffness or tightness of the muscles and can interfere with normal movement, speech, and gait. Spasticity is usually caused by damage to the portion of the brain or spinal cord that controls voluntary movement.
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The Casimir effect is one of several phenomena that provide convincing evidence for the reality of the quantum vacuum â the equivalent in quantum mechanics of what, in classical physics, would be described as empty space. Casimir, H. G. B. On the attraction between two perfectly conducting plates..