What about decay?
A Guardian article about Ligo possibly being used to uncover evidence for string theory's extra dimensions had me wondering, this morning, about testability, and I realised that we *still* haven't observed proton decay - which would be really big deal in confirming some facts about a universe which, I am constrained to point out, has, despite immense scientific effort, not been getting any *less* weird since Einstein muttered about "spooky action at a distance". Personally I still have to deploy the mental "long spoon" when supping with dark matter ...
But, to topic, do thoughts have mass? Insofar as they embody electric charge, then they must do, just as a capacitor must become infinitesimally massier when charged. Does this mean that thinking new thoughts increases one's brain mass? Or, since our mass can, in any given reference frame, change only via our receiving or transmitting something, do mass-increasing thoughts work only when stimulated upon receipt of information from outside ourselves? Does a certain kind of thinking - e.g. complex analysis, creativity, learning - have more mass than other, less challenging 'thought' processes, like watching 'Love Island' or listening to politicians tell lies?
Is it possible that I am getting heavier when reading an electronics textbook, because I am processing and (I hope) storing complex new information? Whereas perhaps the audience at a Donald Trump speech gradually gets lighter, as the listeners know less and less?
"Wow, Doc, this is heavy ..."