About how many new dementia cases occur worldwide each year?
Answernearly 10 million new cases a year
That works out to roughly one new case every three seconds around the globe.
Source: World Health Organization (2021) who.int
Science · Facts & sources
Memory facts & stats
4 sourced facts about human memory and cognition, each with the context behind the number. 4 more are in today's round and appear here after it closes.
Going deeper
According to the Innocence Project, what share of 239 DNA exoneration cases involved mistaken eyewitness testimony?
Answer75% of cases
Human memory for faces and events is far less reliable than most people assume, making eyewitness testimony a leading cause of wrongful convictions.
Source: Wikipedia, eyewitness memory (2024) en.wikipedia.org
Expert level
Up to what share of Alzheimer's cases are 'early onset,' striking people in their 30s to mid-60s?
Answerup to 10%
While Alzheimer's is mostly a disease of older age, a meaningful minority of cases begin much earlier in life.
Source: Wikipedia, Alzheimer's disease (2024) en.wikipedia.org
Alzheimer's disease ranks as about which leading cause of death worldwide?
Answer7th leading cause of death
Despite being a household name, Alzheimer's ranking as the 7th leading global cause of death surprises many people.
Source: Wikipedia, Alzheimer's disease (2024) en.wikipedia.org
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