I guess DC Comics' Man Who Laughs has access to the Large Hadron Collider and a working knowledge of super dense synthetic elements! Just look at the 100% cotton Joker Hahnium Death of the Family T-Shirt displaying the Joker's newly created element with an atomic mass of 105! That's 105 electrons in its outside electron configuration...way more than uranium or plutonium. I can't even imagine what kind of destructive power that has but I'm sure it will be hilarious. Regardless, the Joker Hahnium Death of the Family T-Shirt will make sure that you stay up to date on chemistry lessons!