Interesting - I put "negative mass" into my search engine and some staggering stuff came up, and all from genuine scientific sources.

Makes my head hurt. Heisenberg was spot on when he said "Not only is the Universe stranger than we think, it is stranger than we can think.” Strikes me, not only do we know virtually nothing, most of what we know isn't really true.
.........
Incidentally, at a more mundane level, it's curious that we've develeped an idiom of writing that "we googled something" even when, as in my case, we avoid using Google.
A bit like the way we "Hoover the floor" with a Dyson, or "Butter the bread" with Lurpak or whatever.