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There are some logical things we know to be true: working out is tiring. And being tired helps you fall asleep. But exercise before bed can sometimes have the opposite effect. I have personal experience with this: At one point I was attending a

A ‘shadow’ cast on the faint, leftover glow of the Big Bang has revealed a giant object in the early Universe that defies our predictions of how the Universe should evolve.

It’s a galaxy cluster named SPT2349-56. Spotted a mere 1.4 billion years…