People say things are impossible...
...until someone does it.
Sometimes it's big things. Like landing on the Moon.
Sometimes it's relatively ordinary things, like, "It's impossible to learn piano in your '80's."
But I think both are equally awesome when someone does it.
So, if you think something's impossible, don't give up. Be the one who does it.
(Unless it's something really impossible, like turning a cooked egg back into a raw egg. But we hope silly things like that go without saying.)