Technical question

Saving and undoing work in cells
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Hi, 

A very dull technical question but, in the homework document, I have found that if I accidentally click and then type in someone else's cell I cannot undo the work (Apologies if this was you!) Is there a way that you can protect information written in a cell so that this does not happen on a project or undo as you would in word? I can imagine that important contributions can get lost quite easily this way.