one of my students accidentally hit ‘revert changes’ after a day of work. Is there a way to undo this?
Probably not, no. At least it’s a teachable moment. 
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Yeah I already thought there is no way back…
Who in their right mind works an entire day on something and doesn’t save at least a couple of times? I’m not 100% sure about this, but once you have a save point, all Rhino would do is probably revert back to that one.
When this happens, check in the trash (on Windows at least) for the last autosave from that file - it should have most of the work.
-Pascal