Did Thomas Edison really invented the light bulb?

Most people would believe that Thomas Edison invented the light bulb.

I stumbled upon some trivia that seems to say otherwise:

http://www.coolquiz.com/trivia/explain/docs/edison.asp

So all along it seems that schools have taught this as fact: Thomas Edison invented the light bulb.

Now the truth has changed it seems: it was in fact, Joseph Swan that invented the light bulb.

Facts change, just like once the Earth was flat, now it's round.