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161 with a home radio kit and announced his discovery in a local newspaper. There is a real risk that the claimed discovery might have been dismissed by radio astronomers as preposterous and never investigated.” Given the tendency of each side of the UFO debate to dismiss the other, it may be difficult to keep our minds open to possible alternatives. Still, there is reason to apply Ockham’s Razor, adopting the simplest explana- tion for unusual phenomena until we have evidence to the contrary. As Shklovskii put it in 1971, every object must be assumed natural until proven unnatural. Sagan concurred, saying that extraterrestrial intelli- gence is the explanation of last resort, when all else fails.” A Cautionary Note