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Which of the following reasons do you think best explains why humanity has not discovered or been discovered by an alien species? Published on February 24, 2017 → Survey conducted on February 24, 2017 on 2008 U.S. adults
17%
24%
15%
3%
5%
12%
24%
By:
17%
24%
15%
3%
5%
12%
24%