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Wait, How Does Caffeine Actually Work?

The vast majority of people use caffeine in some form every single day, and most of us use way too much of it. It helps you wake up in the morning, but if you drink too much you get jittery. So how does caffeine actually work?

What Is Déjà Vu?

If you’ve ever been going about your day as usual, only to be struck by the sudden feeling that you’ve somehow—however improbably—already experienced what you’re going through, then congratulations: You’ve just experienced déjà vu. You might even know the name for the feeling. But what is déjà vu, really? And what could possibly explain this weird and unsettling experience?
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