Times New Roman may not be as exciting as some other fonts, but it's the easiest to read. Courier and Arial are other very common, very readable fonts. Finally, after all the rest is said and done, the true extras can be considered. Even if everyone has high-speed internet access, a little goes a long way. As always, think about how valuable whatever you use will really be for the students.
Preventive measures ease computer eye strain and other health problems.
A look at human communication.