My father runs a tutoring business and most students want to move to skyping but I know my father wants to be able to write on something (paper would be ideal, but obviously not practical given the current environment, but an iPad would work) and have the student see it in real time, and then the student also writes in real time and have my father see it in real time.
What did Khan Academy guy Sal do in the early years to do collaborative lessons?
Thanks