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...Over the past 60 years, scientists have figured out what works best in what models. The vast majority of animal testing [today] is in rodents, either rats or mice. Rodents, particularly mice, have very short life spans, so you can see how a compound would react in a young animal, then in the same geriatric animal, and then in the next-generation animal, all in a time frame that is reasonable. Then if a product or a compound is determined to be safe in a rodent, another species is used. For example, if it's a neurological compound, oftentimes...
...There was never much doubt that planets other than the known nine (or the known eight, now that Pluto has been demoted) existed, but it wasn't until 1995 that the first of these so-called exoplanets was discovered. The vast distance between stars makes a comparatively small body like a planet invisible to even the sharpest-eyed telescopes. Instead, astronomers had to rely on a less-direct method, looking for tiny wobbles in the star itself. A star that couldn't stand still was almost certainly being tugged on by something, and that something was likely...
Unfortunately, the dead zone isn't simply an environmental failure, but also a consequence of our national agricultural policy, which subsidizes farmers to grow vast, heavily fertilized quantities of corn and other grains. The pork-laden farm bill, which recently passed Congress over President George W. Bush's veto, will only worsen the problem. And even if we can begin to reduce the future flow of fertilizer, repeated dead zones are having a cumulative effect, with smaller amounts of nitrates and other chemicals in the Gulf having a larger hypoxic impact than in the past. "We have to decide...
...China's May 12 temblor centered in Sichuan devastated a vast area of wild habitat for endangered species, including the giant panda, Cao Qingyao, a spokesman for the State Forestry Administration, told reporters...
...bought. They shovel through data about millions of buyers and tens of millions of sales and then, like the shopkeepers, come up with a suggestion. However, the computers don't do all this in a 1,400-g (3 lb.), walnut-wrinkled mass of brain tissue but in a vast network of computers. It's easy to say that one approach is more complex than the other. It's a lot harder to say which...