In his Aug. 31 Free for All letter, “The scientific likelihood of alien life,” John Walker wrote that Americans should have answered “yes” to the survey question “Do you believe in UFOs and aliens?,” saying that “any self-respecting scientist” is likely to “profess a belief in aliens.”

Well, no. Scientists would say there’s a probability that there’s life on other planets, but certainly not that there are “aliens” — in other words, beings from other planets coming to Earth — or UFOs, the vehicles to bring them here.

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