Why cramming fails and spacing works
In 1885 Hermann Ebbinghaus published a strange experiment. He had spent months memorising lists of nonsense syllables, like WID and ZOF, and testing himself on how many he could still recall hours and days later. Nonsense was the point: real words carry meanings and memories that would muddy the results.
What he found is now called the forgetting curve. Memory falls fastest right after learning, and then the decline slows down. Much of what he learned was gone within a day unless he went over it again.
He also noticed the way out. Each time he reviewed a list, it took less effort to relearn, and the curve after each review was flatter. Reviews spread over several days kept the syllables far longer than the same number of repetitions crammed into one sitting.
More than a century of research has confirmed this spacing effect for words, facts and skills. One explanation is that a little forgetting helps: pulling a memory back when it has started to fade makes it stronger than reading it again while it is still fresh.
The practical version is simple. Study a little, stop, and come back tomorrow, then a few days later, then a week later. Test yourself instead of rereading. It feels slower and harder than cramming, and that difficulty is exactly what makes it last.
Which plan helps you remember a list the longest?
You remember more when you study in short sessions spread over days than in one long session the night before.
