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We’ve long known that some animals depend on the Sun to navigate the world. However, new research may have uncovered the first insect we know of that does the same using the stars and night sky. The stars have long been a navigational tool for humans. For instance, think of the North…

Negative-calorie or zero-calorie foods are controversial despite their popularity on diet websites. The idea is that our bodies use as much (or more) energy to digest a chosen fruit or vegetable as the energy it provides.

But there’s no scientific evidence for this food fad, with even the lowest…