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TIL a nationwide study conducted by the U.S. Geological Survey in 1999 and 2000 found low levels of pharmaceuticals—including antibiotics, hormones, contraceptives and steroids—in 80 percent of the rivers and streams sampled.

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nWWdb TIL that the awarding of As at four-year colleges has been increasing by 5-6% per decade since 1960; an "A" is now the most common grade, accounting for about 42% of all grades, 3x more than in 1960.
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4X5wX TIL the Adoration Of The Magi is an unfinished work by Leonardo da Vinci commissioned by a Florentine monastery in 1480. Consistent with his proneness to abandon projects, he eventually grew bored with it, simply left, and moved to Milan. The monastery paid Filippino Lippi to complete it instead.