Most computers and chargers still use two prong plugs. I remember when I lived overseas I bought a new charger for my computer from a mail order place in the States and I didn't realize it had a three prong plug. The country that I lived in was on a 220 volt/60 Hz current but used the the old two flat prong outlets for which my charger, which worked on any voltage, so I still had to wait to use it as I had to order an adapter to accommodate that.
When did the two prongs become different sizes? That change happened while I wasn't watching. I'm pretty sure our house had two-prong outlets with identical holes, and the first time I encountered a polarized plug, I nearly broke the outlet I was attempting to plug it into.
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