GFCI Outlets vs. Breakers: What’s the Difference? 

Great info. Thanks! If I have receptacles without a ground wire, but I installed 3 prong outlets, what should I consider to make it safe (primarily only bedrooms and a living room have this issue) (I’ll have an electrician do it, but I want to be educated a bit first).

6:33 though I would think that miliseconds are significant in the event of an electrocution

Please be advised by a real electrician before going forward.