> Physicists already understand quantum mechanics. No, they don't in fact. Most of them even admit that they don't understand it at all, yet it works for them

> Physicists already understand quantum mechanics. No, they don't in fact. Most of them even admit that they don't understand it at all, yet it works for them so far, except when it comes to the precise origin of gravity. Some say that the reason why quantum mechanics and gravity couldn't be reconciled until today, because nobody on earth truly knows how exactly quantum mechanics works yet.