I'd also like to add that I just found a bulletproof whiteboard. Pictures show it can be used to write area formulas AND stop bullets. Interesting market they're going for. http://www.amazon.com/Hardwire-Bulletproof-Whiteboard-Shield-Compliant/dp/B00BUPDAV0/ref=sr_1_17?ie=UTF8&qid=1400053348&sr=8-17&keywords=personal+whiteboard