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DescriptionScientific American - May 2015 {Bindaredundat}  FEATURES PALEONTOLOGY 34 Rise of the Tyrannosaurs The fearsome T. rex turns out to be a late descendant in a family of surprisingly humble, mostly human-sized creatures. Some of them had truly bizarre anatomical features. By Stephen Brusatte PARTICLE PHYSICS 42 The Glue That Binds Us Gluons are what keep protons and neutrons—and the universe for that matter—from coming undone. How they do it is an enduring mystery. By Rolf Ent, Thomas Ullrich and Raju Venugopalan MEDICINE 50 Lifting the Curse of Alzheimer’s As the search for a treatment turns to prevention, a couple of dozen Colombian families with a rare genetic form of the disease have emerged to play a key role. By Gary Stix COMPUTING 58 The Search for a New Machine Computer chipmakers are betting billions on new technologies to improve performance. By John Pavlus OCEANOGRAPHY 64 Waves of Destruction The disappearing Arctic sea ice has given rise to towering waves that have far-flung effects on climate and ecology. By Mark Harris BIOLOGY 70 Cellular Small Talk Hearing loss, heart disease and other ills may start when communication between adjacent cells gets disrupted. By Dale W. Laird, Paul D. Lampe and Ross G. Johnson SATELLITE IMAGERY 78 Night Watch A satellite sensor that can see in the dark offers much needed information to meteorologists, firefighters and search teams. By Steven D. Miller  Qianzhousaurus, which was discovered at a Chinese construction site, is one of the most recent additions to the family tree of tyrannosaurs. Such finds are revolutionizing paleontologists’ understanding of the origin and evolution of this group. They reveal that a startling variety of tyrannosaurs roamed the earth right up until the end of the Age of Dinosaurs. Illustration by James Gurney.  Why Girls Are Starting Puberty Early  Lifting the Curse of Alzheimer’s  Related Torrents
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