A lot of people are nowadays taking substances known as nootropics or "smart drugs". These drugs increase their users cognitive abilities, improve focus, motivation and general productivity, while being seemingly safe. And one of the biggest nootropics is Modafinil. It's a drug of great benefits and use, but also a bit of controversy. If you're interested in it, you can read about it here: http://www.psychedelicheaven.com/2017/11/13/everything-you-need-to-know-about-modafinil/
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From @mateushism