Coffee achievers

...this user-friendly manual offers advice on the optimal ''dosing'' that will make us smarter, calmer, safer, thinner, healthier, sexier, less bored and ''hostile.'' The trick is for each user to ride the Yerkes-Dodson Biophasic Curve, which tracks that mystical point beyond which caffeine's benefits begin to reverse themselves.

Boston Globe [boston.com] via Fark