Learned D3 at Businessweek, started using Observable to do my job at Kensho, took time off to write notebooks about Mayans and Galton, moved to San Francisco to work for Observable. Now work for it remotely from the Berkshires where my wife runs Avaloch.
Ha, hm!! Let's say A and B are two things that may be true or false, with some probability. If A and B are not independent, then the probability of A is changed by knowing B, and vice versa. The probability of A, if you know B, is not the same as the probability of B, if you know A; to get from one to the other, multiply it by the ratio of the probabilities of the thing given to the thing unknown. The ratio of the probability of A given B to that of B given A equals the ratio of the probability of A to that of B. When A and B are similarly probable, the probabilities of each given the other will be similar. But when A is much more probable than B, then the probability of A given B is much greater than the probability of B given A. So even if A and B are correlated, then knowing A is true shouldn't give you much confidence that B is also true.