‘So, a lot of us figure that our thoughts and actions are free. But, most of us also believe that every effect has a cause, and that everything that happens now, in the present, is the necessary result of events that occurred in the past. This view is known as hard determinism. And [many people would argue that both can be true]; that many of your actions are free, and that the world is governed by cause and effect.
But, it turns out, you can’t rationally hold both views. Because, traditionally, libertarians have defined free actions according to what’s known as the Principle of Alternate Possibilities. That might sound like the plot device for a sci-fi show, but this principle says that an action is free only if the agent – that is, the person doing the thing – could have done otherwise.
So, truly free actions require options. Determinism, by contrast, doesn’t allow options. It holds that every event is caused by a previous event. Which means that an agent can never have done anything other than what they did, and therefore, they are never free.’
– Green. H. (2016, August 15) Determinism vs Free Will: Crash Course Philosophy #24
When learning foreign language vocabulary, repeated practice is essential for success; as words get established in the long-term memory, learners can move on and focus on new skills.
Two effects are at play in this process: the spacing effect, the finding that short practices spaced out over time is better for learning than cramming; and its related finding, known as the lag effect, which states that learners improve if they gradually increase the spacing between practices.
These ideas go back to 1885, when German psychologist Hermann Ebbinghaus pioneered the concept of the forgetting curve. He tested his ability to remember a string of words over different periods of time and found a consistent pattern to the decline of his ability to recall these words over time. Immediately after the learning experience, his recall was 100 percent, but memory dropped steeply the first few days. Further, he found that the memory loss was exponential, meaning it increased by the square of the previous number until finally flattening out at around 30 days post-learning.
According to Ebbinghaus’ findings, the way to counter the forgetting curve (i.e. learners are more successful) when they plan short practice sessions and gradually increase the amount of time between each session.
 ‘Repeating list items leads to better recall when the repetitions are separated by several unique item than when they are presented successively; the spacing effect refers to improved recall for spaced versus successive repetition (lag > 0 vs. lag = 0); the lag effect refers to improved recall for long lags versus short lags.’
– Kahana. M.J., Howard. M.W. (2005) Spacing and lag effects in free recall of pure lists Psychonomic Bulletin & Review, 12 (1), p. 159-164
When Dr Samuel Johnson had finished his great lexicography, the first real English dictionary, he was visited by various delegations of people to congratulate him including a delegation of London’s respectable womanhood who came to his parlour in Fleet Street and said ‘Doctor, we congratulate you on your decision to exclude all indecent words from your dictionary.’ Whereupon he said ‘Ladies, I congratulate you on your persistence in looking them up.’