Word: rare
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...second paper in Nature, published by the same team at CHOP along with scientists at numerous other institutions, looked at a specific kind of genetic change: deletions and duplications of genes. While there are many such changes associated with autism, most are very rare. This paper, however, found an intriguing pattern among two genes already linked to autism and nine newly identified targets. Most play a role in two key systems in the brain. One is the same brain-wiring system - neural cell adhesion - implicated in the first paper. The second is a set of housekeeping proteins - the ubiquitin system...
...graduate student at the California Institute of Technology. An advisor was using the interplanetary dust particles that have been settling on the Earth’s surface throughout its history as a way to reconstruct past variations in climate. They found that helium-3—a rare noble gas isotope that is extremely depleted on Earth—proved to be a good tracer for the dust particles. “If you imagine material from space is raining down at a constant rate, and you measure the amount, you can basically figure out time...
...also says that she wants to dispel the stereotype that Chinese culture can be described in full as Confucianism. “It’s much bigger and much more complicated than that,” she says, her voice betraying a rare hint of exasperation...
...asteroid charged with killing the dinosaurs, after all, left more than the Chicxulub crater as its calling card. At the same 65-million-year depth, the geologic record reveals that a thin layer of iridium was deposited pretty much everywhere in the world. Iridium is an element that's rare on Earth but common in asteroids, and a fine global dusting of the stuff is precisely what you'd expect to find if an asteroid struck the ground, vaporized on impact and eventually rained its remains back down. Below that iridium layer, the fossil record shows that a riot...
...highest levels of his party and then publicized it, thus becoming the first senior official in Africa to blow the whistle on his own government. The story of his struggle to do so, told in Michela Wrong's new book It's Our Turn to Eat, provides a rare insider's look at corruption in a developing society. It also shines an unflattering light on the complacency of some major Western aid donors, whose preference for pumping money into the continent may, the author argues, be perpetuating the problem...