About the time that seeing a UFO was taken to equate to proof that extraterrestrials were visiting Earth.
The need for extraordinary proof for an extraordinary claim is the flip side of Woodwards admonition: "When you hear hoofbeats behind you, don't expect to see a zebra". The less probable the claim, the more stringent the evidential requirement to establish that claim. Sometimes the hoofbeats just arent enough...
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About the time that seeing a UFO was taken to equate to proof that extraterrestrials were visiting Earth.
The need for extraordinary proof for an extraordinary claim is the flip side of Woodwards admonition: "When you hear hoofbeats behind you, don't expect to see a zebra". The less probable the claim, the more stringent the evidential requirement to establish that claim. Sometimes the hoofbeats just arent enough...