In popular cultures, "Extraterrestrials" are life forms — especially intelligent life forms— that are of extraterrestrial origin (often also called "aliens").
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“I have scarcely felt greater pain in my life than on learning yesterday from Bob’s letter, that you had failed to enter Harvard University. And yet there is very little in it, if you will allow no feeling of discouragement to seize, and prey upon you.”
—Abraham Lincoln (1809–1865)