Scientists are a step closer to resolving this head-scratcher. And their findings have potential consequences for the fight against pain and addiction.
Scientists have identified genetic variants less common in older people than younger people. They say it's natural selection at work, continuing to weed out disadvantageous traits.
The climatic effect of a large-scale conflict "... would be similar to that of the giant meteor believed to be responsible for the extinction of the dinosaurs. This time, we would be the dinosaurs."
Researchers at SLAC and Stanford have been using brain-mimicking neural networks to analyze the spacetime distortions of gravitational lenses. They say their analysis is 10 million times faster than before.
As Hurricane Harvey shows, flooding can happen wherever large storms stall and dump lots of rain. A new study finds development is increasing in flood zones far from any coast.
Members of the EarthSky community - including scientists, as well as science and nature writers from across the globe - weigh in on what's important to them.
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