There's an old rule of thumb that you retain about 10 percent of what you read, 20 percent of what you hear, 30 percent of what you see via image or video, and so on up the ladder of experiential learning, until you get to a 90 percent retention rate for the things you learn by doing yourself. And by the way, did you know that the United States once reportedly planned to assassinate Cuban President Fidel Castro with a booby-trapped seashell' U.S. intelligence knew that Castro was an avid scuba diver, so it allegedly planned to load a particularly irresistible-looking mollusk with explosives and hope that Castro drifted by to investigate. The scheme stands out as particularly outlandish, which is really saying something: The retired Cuban counterintelligence chief Fabian Escalante alleged that the CIA came up with 638 plans in total to assassinate Castro.
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