No "brain hacks." No secret tricks. Just cognitive science that's been studied for over a century, applied properly for the first time in a daily app.
In the 1880s, psychologist Hermann Ebbinghaus discovered that without review, we forget roughly 70% of new information within 24 hours. This is why re-reading feels productive but barely works — your brain quietly deletes what it doesn't see again.
How Mnemio uses this: every lesson is followed by spaced, active reviews timed to interrupt the curve before it drops.
Neuroscientist Eleanor Maguire (UCL) scanned London taxi drivers who had memorised over 25,000 streets. Their hippocampus — the brain's memory centre — was physically larger than average. When drivers retired, it shrank back.
What it proves: memory isn't fixed. Your brain restructures itself around what you actually practice.
Used by Roman orators over 2,000 years ago, and by every modern World Memory Champion. It works because your brain evolved to remember places exceptionally well — the technique borrows that ancient spatial memory to store anything.
In Mnemio: Week 2 is dedicated entirely to building your first palace, step by step.
A major review of learning techniques (Dunlosky et al., 2013) ranked spaced practice and self-testing as the most effective study methods — and highlighting/re-reading among the least effective.
In Mnemio: Week 4 builds this directly into your daily 9-minute habit.
A randomized trial (Erickson et al., PNAS 2011) found that a year of regular aerobic exercise grew the hippocampus by about 2% in older adults — reversing typical age-related shrinkage.
In Mnemio: Week 4 covers the sleep, movement and focus habits that power everything else.
Dominic O'Brien, 8× World Memory Champion, memorised the order of 2,808 shuffled playing cards seeing each card only once — using the same journey-based techniques taught in this app.
The point: not to memorise cards — but proof of what a trained ordinary brain can do.