The miraculous effect of music: Concerts bind people together

Why does music exist? Some researchers believe that music is so widespread across human cultures because it brings people together. The theory is that during evolution, human groups who were musical worked better together, ...

X-ray lasers: Why does brighter mean darker?

When we illuminate something, we usually expect that the brighter the source we use, the brighter the resulting image will be. This rule also works for ultra-short pulses of laser light—but only up to a certain intensity. ...

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