Alexander

“But that's - I'm sorry, but that's completely ridiculous! How can I possibly prove it doesn't exist? Do you expect me to get hold of - of all the pebbles in the world and test them? I mean, you could claim that anything's real if the only basis for believing in it is that nobody's proved it doesn't exist!”
― J.K. Rowling, Harry Potter and the Deathly Hallows