Birthday Paradox

Put 23 people into a room and there is a 50% chance that two of them will share a birthday. How? Hint: there are 23 nodes along the circumference of the circle to the left. Go.
Zeno's Paradox

Zeno reasoned that if space is infinitely divisible, then Achilles will never catch the tortoise. He'd also then argue that the area of the box to the left is infinite. It isn't.