Now that you know exactly when you're supposed to drink your morning cup of Joe, researchers went back to the lab to determine exactly how much of it you should be sipping if you want to be smart. Turns out that drinking two espressos-worth of coffee every day will help you remember important things and possibly make you a bar trivia MVP.
Michael Yassa, a neuroscientist at the University of California, Irvine, discovered that 200mg of caffeine actually improved people's long-term memory. Before arriving at this conclusion, Yassa found 160 volunteers who didn't drink much caffeine and broke them up into two groups. Both groups were asked to look at a series of images and then received a pill... only one group got a placebo pill and the other group got a doped-up caffeine pill. When they were asked to look at images again the next day and mark them as "old", "new", or "similar", the caffeinated volunteers did way better than their sugar pill-popping compatriots.