Hello guys, Haven't posted in a long while, but I need some advice. Not sure this is the proper subforum, but here it goes: My PhD advisor is currently in another city (and will be there for a long while). Since we interacted frequently when he was around, we started using the phone or skype very frequently. One thing is missing however: we cannot easily draw equations/drawings/graphs for each other. I was wondering if someone has good advice on how to solve this problem. I did some research on google (skype with yugma is an idea), but I thought some of you might have some experience with something like this and might know what the best tools for doing physics are. I wouldn't mind spending some money on some kind of drawing board that I connect to my PC (as long as it's not super expensive). Thanks!