How Many Countries Are There?
CPGGrey explains why it is not that easy to determine the number of countries in the world. [via CGPGrey]
CPGGrey explains why it is not that easy to determine the number of countries in the world. [via CGPGrey]
MinutePhysics looks at the mind-boggling many-worlds interpretation of quantum mechanics, which implies that all possible alternative histories and futures are real. [Via MinutePhysics]