In five years of teaching Earth science, nothing frustrated me more than watching a student who crammed the night before an exam forget everything a week later. “Did we actually learn this, teacher?” Every time I heard that question, I ran headlong into a fundamental problem with education [1].
I’ve spent a lot of time researching this topic, and here’s what I found.
Why We Forget What We Learn
In 1885, German psychologist Hermann Ebbinghaus conducted one of the most important learning experiments in history. He memorized lists of nonsense syllables and measured how much he forgot over time. The results were striking — he forgot 56% within one hour, 67% within a day, and 79% within a month [1].
Related: evidence-based teaching guide
This is the famous Forgetting Curve. I have it posted on my classroom wall. Whenever students ask “why do we have to review this?”, I point to that graph.
Ever noticed this pattern in your own life?
I believe this deserves more attention than it gets.
The 3 Stages of Memory: Encoding, Storage, Retrieval
In cognitive psychology, memory is divided into three stages [2]:
Last updated: 2026-04-06
Your Next Steps
- Today: Pick one idea from this article and try it before bed tonight.
- This week: Track your results for 5 days — even a simple notes app works.
- Next 30 days: Review what worked, drop what didn’t, and build your personal system.
About the Author
Written by the Rational Growth editorial team. Our health and psychology content is informed by peer-reviewed research, clinical guidelines, and real-world experience. We follow strict editorial standards and cite primary sources throughout.
References
- Ebbinghaus, H. (1885). Memory: A Contribution to Experimental Psychology. Teachers College, Columbia University.
- Atkinson, R. C., & Shiffrin, R. M. (1968). Human memory: A proposed system and its control processes. Psychology of Learning and Motivation, 2, 89-195.
- Roediger, H. L., & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249-255.
- Cepeda, N. J., et al. (2006). Distributed practice in verbal recall tasks. Review of Educational Research, 76(3), 354-380.
- Rohrer, D., & Taylor, K. (2007). The shuffling of mathematics problems improves learning. Instructional Science, 35(6), 481-498.
Disclaimer: This article is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making health-related decisions.
