Coffee is a brewed beverage with a strong flavor prepared from the roasted seeds of the coffee plant.

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How to concentrate without external stimulants?

I'm a programmer and my work requires intense mental focus. My goal is to get 8 clean, productive hours of programming per day. I tried this yesterday, and I managed to get only 2:35 hours of clean ...
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Coffee: good or bad for work? [closed]

Are there any reliable researches defending the regular consumption of coffee at work?