That's the mystery two researchers are working on in this photo from the April 1940 issue of Popular Science:
Hey, it only took us 73 more years to invent a barfing machine! Now that's progress.
So let me get this straight: PopSci wants us to "Let's take a break from trying to wrap our brains around quantum teleportation and robot aliens," so i can wrap my wee brains by reading up on 'Why Are These Two Scientists Sneezing On A Rabbit?'..Right. One would perhaps rather risk brainfreeze contemplating quantum physics.