Light is usually described using quantum mechanics when phenomena like entanglement enter the picture. But a new paper shows ...

Lower back spasms are involuntary contractions or tensing of the muscles in the lower back, and they may affect movement. Doctors may recommend medications, lifestyle changes, and complementary ...

Since Philadelphia is arranged on a grid system, the mostly one-way roads are easy to navigate. Helpful maps are posted along street corners across the city – watch for the "Walk! Philadelphia" signs ...

Abstract: In this article, we report several new geometric and Lyapunov characterizations of incrementally stable systems on Finsler and Riemannian manifolds. A new and intrinsic proof of an important ...

Abstract: Recently, motor speed reference generators have been designed for the cruise control of electric vehicles with either centralized electric motors (straight manoeuvres) or in-wheel motors ...

Contraction of group representations is shown to be the mathematical structure which controls the spontaneous breakdown of symmetry. The Haag expansion among the generators of the invariance groupG of ...

Voluntary muscles can be controlled by the person, like muscles in your neck and legs. Involuntary muscles work without you thinking about it, like your heart and stomach muscles. Skeletal muscles ...

Clonus causes involuntary, rhythmic muscle contractions when a muscle is stretched. It is often observed in conditions like multiple sclerosis, stroke, and cerebral palsy. Clonus can be diagnosed by ...

We have the 3-letter answer for Poetic contraction crossword clue, last seen in the Eugene Sheffer Crossword December 30, 2025 puzzle. Let us help you solve the crossword clue that has you stumped so ...