How to revert an edit

I was wondering how to revert an edit made on political bias. This user deleted the majority SeaWorld Orlando but the rest of their edits look to o...

What happened to the Railroad=Preserved rendering

I have been noticing the removing of the preserved railway line rendering on the standard map. Is this a glich or is no longer going to be rendered...

Is there a way to over lay a newer background map?

Is there a way that I can overlay a newwer background map? I been working for a while on a map that is almost 3 years out of date. Can I just overl...

Is there an app? Who's doing the app?

I love editing OSM so much that to make so accurte I would like to to take it on the go and map on location. Who is making an OSM App for Android a...