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A team of physicists has created a "hole in time," where things that happen are completely undetectable to ordinary observers. It’s as if they never occurred. Called "temporal cloaking," this could eventually provide a way for a country like Iran or North Korea to make nuclear weapons in complete secrecy.

Earlier attempts to make things invisible involved "spatial cloaking," bending light around an object in a way that makes it disappear from view. In the Washington Post, David Brown quotes physicist Moti Fridman as saying, "We think of time in the way that other people think of space. What other people are doing in space, we can do it in time."
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Winter can be a depressing time of year. Gray days may keep you indoors, but if you’re gloomy, you may need to get out in the sun, because low levels of vitamin D (the vitamin you get from sunlight) have been linked to depression.

Psychiatrist . E. Sherwood Brown says, "Our findings suggest that screening for vitamin D levels in depressed patients–and perhaps screening for depression in people with low vitamin D levels–might be useful."
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