The exact change
"The spacing effect is one of the most robust phenomena in cognitive psychology, and one of the least utilized by students. Distributing study across time -- even when total study time is held constant -- consistently produces retention advantages of 50-200% compared to massed practice, measured at delays of one week or more." -- Dr. Robert Bjork, Department of Psychology, University of California Los Angeles [...] 40% within 20 minutes / 60% within an hour / 75% within 24 hours / 90% within a week
The spacing effect is one of the most robust phenomena in cognitive psychology, and one of the least utilized by students. Distributing study across time, even when total study time is held constant, consistently produces a meaningful retention advantage over massed practice at delays of one week or more. [...] 42% within 20 minutes / 56% within an hour / 66% within 24 hours / 75% within a week
Suggested change
De-attributed the Bjork quote and removed the fabricated embedded statistic; corrected the Ebbinghaus figures to match the verified-accurate set already established in the sibling article, resolving the cross-article contradiction.
Why this is better
Removed an unverified quote attributed to Dr. Robert Bjork containing an embedded unverified '50-200% retention advantage' statistic, and corrected a set of Ebbinghaus forgetting-curve figures (40%/60%/75%/90%) that contradicted the different, already-fact-checked figures used for the same concept in the sibling article how-long-term-memory-works-certification-study.md. Also corrected the same unverified statistic where it had leaked into the post's excerpt and meta description fields.
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