Knowledge

Are Hummingbirds the Only Birds that Can Fly Backwards?

Nope. See, for example: http://www.allaboutbirds.org/guide/Acadian_Flycatcher/lifehistory This falsehood was started by the Trivial Pursuit game I believe, and seems to have entered popular culture (e.g. “Assembling the Wreckage” by Kevin Fisher p. 109). For me, this is another example of the importance of critical thinking and always challenging the dominant paradigm.