Science · Guess the stat
Guess the real numbers behind how memory works, see how everyone else guessed, and get the source.
About how many new dementia cases occur worldwide each year?
Guess, see the crowd, get the real number. One ranked attempt per day.
Real figures with their sources. All Memory facts →
7 items (plus or minus 2)
Miller's 'magical number seven' became one of the most cited findings in psychology, though later research suggests the true limit may be smaller.
Source: Wikipedia, Miller's law (2024) en.wikipedia.org
about $1 trillion a year
That cost covers medical care, social care, and lost income for both patients and unpaid family caregivers.
Source: Wikipedia, Alzheimer's disease (2024) en.wikipedia.org
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Each question asks you to guess a real number about human memory and cognition. After you answer you see how everyone else guessed, then the real figure and where it comes from.
Four stats and one opinion poll. A correct guess earns 100 points plus up to 50 for speed, with a combo bonus for answers in a row. The range next to the right answer earns 40. Opinion polls earn 25 for having your say, and nailing every stat adds 150.
Every stat links to its source, such as government statistics agencies, research organizations and industry groups. Figures are checked against the source before they go live.
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