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This unstable heart rhythm produces an ineffective heartbeat , and the heart quivers uselessly . Some people who pull out their hair say that a particular color , such as gray hairs , a particular shape , such as curly hairs , or a particular texture , such as coarse hairs , triggers an urge to pull out those hairs . That is , the library , acting on behalf of its user , requests an item from another library , receives the item , loans the user the item to use , and then returns the item to the owning library . An interactive historical scene page describing the long march back to Canada . In 1765 , Leonhard Euler ( 1707-1783 ) discovered an example in which three masses start in a line and rotate so that they stay in line . Rarely , a heart attack can occur when a blood clot from inside a diseased heart breaks loose and lodges in a healthy or narrowed coronary artery . A group of four hospitals , led by Cincinnati Children 's Hospital Medical Center , are starting a large-scale study this spring examining how children respond to various types of weight-loss surgery , including the gastric bypass , in which a pouch is stapled off from the rest of the stomach and connected to the small intestine . Putting an emphasis on preservation may detract from or slow down efforts to fill repositories . Liaw and his coworkers worked with a Turing model that involves two interacting morphogens - - an activator and a substrate - - and takes into account the curvature of the lady beetle 's body by using a portion of a spherical surface to approximate the geometry of the wing covers .