Via C-SPAN
Alzheimer's Disease is no laughing matter, but these Twitter memes certainly are. When Twitter user Lira Mercer asked followers their thoughts on infant vaccinations, one person responded saying they were against them, asserting that as a consequence babies can acquire "Down syndrome, Alzheimer's, etc."
Of course, this person probably meant to say autism and not "Alzheimer's," but the damage has already been done. Now let the facepalm fest commence.
Fair to say that Neil deGrasse Tyson wasn't ready for Bill Nye to come in there and tease his lengthy rant about how consciousness doesn't exist.