I have worked on this for hours now and mistakenly deleted everything by only deleting a big bracket. I cannot undo or redo - cannot access any of my slides I have finished recently, but the ones I have started with. I need to go back to around 0:30am UTC Nov 22 . I need this presentation in 5h - please HELP. Thank you, thank you, thank you!
http://prezi.com/_qanwleozfqo/edit/#2...
http://prezi.com/_qanwleozfqo/edit/#2...