Power Adaptor-2 vs 3 Prong

Hardware stores sell adapter that have two blades for the wall and an extra loop that is supposed to be secured to the receptable assembly by a metal screw (that make the house ground). On the other side it lookes like a 2-blade_prong.

Or upgrade the wiring in your house. There is a reason electical code went from knob-and-tube in the 20s and pull-block 5 amp fuses but now requires even GFCI within 5 ft of water with 12 gauge wire in the walls instead of the 14 gauge that was allowed 10 years ago.

Because there are safety and equipment-protection advantages in grounded connections -- and that's also why the electrical codes in modern nations require all new outlets to be properly grounded. To connect the Apple cord to your antiquated and possibly unsafe outlets, use a 99-cent two-prong adapter. You won't be properly grounded, but you'll have an extra 6' of cord to work with.