Re: Phlogiston
Yep. When the evidence started to mount against phlogiston they tried to salvage it by saying sometimes it had positive mass and sometimes it had negative mass.
Now we have dark matter pulling things together and dark energy pushing them apart. It would be amusing if they shared the same cause, and that cause was some kind of boson, because boson names often end in -on. So we could call it the phlogiston. So apt.