Nothing is impossible

What is possible in this whole wide world?
Why people keep saying nothing is impossible.
Just imagine...
You're holding a toothpaste tube.
I press the tube and surely the toothpaste would come out.
Now just give your best on squeezing the toothpaste back into the tube.
Manifestly you couldn't make it you see.
So why do you care to settle something that is uncertain.
Just think about it.