From 1880 to 1885, Hermann Ebbinghaus ran a study about the memorisation of nonsense syllables, such as "WID" and "ZOF" by repeatedly testing himself after various time periods and recording the results. He plotted these results on a graph creating what is now known as the "forgetting curve".
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.
Over time, there's a very close correlation between what happens to the dollar and what happens to the price of oil. When the dollar gets week, the price of oil, which, as you know, and other commodities are denominated in dollars, they go up. We saw it in the '70s, when the dollar was savagely weakened.