Each week Joshua Fruhlinger contributes This is the Modem World, a column dedicated to exploring the culture of consumer technology. It's back to school season, and if you're one of the younger Engadget readers, surely you did a little supply shopping. Perhaps you bought some pens, pencils, paper and notepads. Maybe you even landed a new laptop, tablet or printer. You probably tried to convince your parents that Xbox Live has a live after-school study group that can help you excel in calculus. (Parents: I'm not going to say if it does or
