Lodestone, a naturally-occurring iron oxide, was the first persistently magnetic material known to humans. The Han Chinese used it for divining boards 2,200 years ago; ancient Greeks puzzled over why iron was attracted to it; and, Arab merchants...
In a laboratory at the Stanford University School of Medicine, the mice are seeing things. And it’s not because they’ve been given drugs.With new laser technology, scientists have triggered specific hallucinations in mice by switching on a few...
For some practical tips on how to get more shut-eye, I sought out Raphael Vallat, a postdoctoral researcher at the Center for Human Sleep Science at the University of California, Berkeley. His most important advice: Do not check...
Rebecca Katz, director of the Center for Global Health Science and Security at Georgetown University, said in a statement: “Almost all international legal and policy experts agree that the conditions for declaring a public health emergency of international...

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