@Pat In my experience smoke also just hangs there with gravity... Or at least a lot longer than I like to when I'm standing next to a damn smoker. :p
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Yeah, this was a joke, but I just turned it into a puzzle and posted it to the local timeline. (regular Earth gravity, but no air)
I had to delete/re-edit that original toot. Here's a link to the new one. (Only one day left!)
@Pat
Something is wrong with the link.