Importance of a good caffeine intake in research
Perhaps the brand should have been included in the acknowledgments, but this is the most firm evidence I've yet seen for the place a high level of caffeine intake should take in one's research:
The paper in general looks impressive, but page 19 particularly!
NB. This is not a mistake, it's included as a pdf on the background.
(That said, I've been on the wagon for five months now and feeling better for it.)