Those of us who are right-handed can tighten screws and jar lids more forcibly than we can loosen them. Our everyday activities turn on the performance of nature's main engine: we may breathe harder going uphill, but we put more strain on our muscles walking downhill. Although muscles differ little in appearance and performance across the animal kingdom, they accomplish tasks as diverse as making flies fly, rattlesnakes rattle, and squid shoot their tentacles. Whether we blink an eye, lift a finger, throw a spear or a ball, walk, run, or merely breathe, we are using muscle. Lewis George Orwell Mary Pope Osborne LeUyen Pham Dav Pilkey Roger Priddy Rick Riordan J. By AUTHOR Jane Austen Eric Carle Lewis Carroll Roald Dahl Charles Dickens Sydney Hanson C.Indestructubles Little Golden Books Magic School Bus Magic Tree House Pete the Cat Step Into Reading Book The Hunger Games ![]()
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