Guides
Longer answers than a FAQ can hold: what the numbers measure, what actually moves them, and where the science stands. Every guide links the tests it talks about.
What a reaction time is made of
The journey from photon to muscle, why nobody clicks in under 100 ms, and what choice and inhibition add. The science behind the reaction tests.
What actually makes you faster
Sleep, caffeine, exercise, practice and hardware, ranked by evidence. What moves a reaction time, what only feels like it does, and what to expect.
The lag your device adds
Screens, mice, touchscreens and wireless links all add real milliseconds to every score. Where device lag hides, how big it is, and what to do.
How much a head can hold
Digit span, chunking, why pictures beat lists, and the chimpanzee who beats humans. The science behind the four memory tests.