Spitzer tested 1939 the effects of a type of spaced repetition with over 3600 students who were learning science facts and showed that spaced repetition was effective.
Our brain forgets quickly newly learned information. Spaced repetitions are the most effective approach to internalize.
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The speed of forgetting depends on a number of factors such as the difficulty of the learned material (e.g. how meaningful it is), its representation and physiological factors such as stress and sleep. Furthermore higher original learning also reduces forgetting. The rate differs little between individuals.
I think Britain can be one of the great success stories of the 21st century - we've got the talent, the drive, the connections around the world. But if we vote to Leave, then we lose control. We lose control of our economy, and if you lose control of your economy you lose control of everything. That's not a price worth paying.