The Quantified Mind site is presently running five free experiments to see what makes you smarter. The tests on the site are designed to measure your working memory, reaction times, motor and executive functions. The experiments being tested are:

• skipping breakfast
• coffee
• time of day effects
• meditation
• sex

The tests range in duration from 4-10 minutes each and require between 23 to 50 sessions. Learning which of these things effects your performance could optimize workday performance. You can even create your own tests through their site. This seems like it would be a good tool for testing supplements and nootropics for performance enhancing claims. After you complete an experiment you can see go to their “Data Minding” area to view and download your results.

The coffee experiment would look like this: