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TIL that the human eye is sensitive enough that -assuming a flat Earth and complete darkness- you could spot a candle flame flickering up to 30miles (48 km) away.

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QJWo9 TIL of the art movement called Accidentalism, in which a portrait is painted first, and only after the work is done a person is looked for that looks like the one in the painting. There are still portraits that have not found a subject yet.
OoPrg TIL that actor Val Kilmer (Top Gun, Batman Forever) has been fighting throat cancer and had a procedure on his trachea that has reduced his voice to a rasp.
8aZDV TIL - In certain cancer cases acute secondary infection causes the immune system to destroy the cancer leaving the patient free of that cancer for life. At least one doctor named William Coley developed a therapy to recreate this scenario under controlled conditions.
kOJbW TIL: When FDR died, Eleanor Roosevelt told Harry Truman that the president was dead. When he asked there was anything he could do for her, she replied, “Is there anything we can do for you? For you are the one in trouble now.”
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