The moment we start pondering infinity, we run into one of the oldest and most frustrating puzzles in history: Zeno's Paradoxes. In the 5th century BCE, Zeno of Elea put forward an idea that has been haunting mathematicians and philosophers ever since: Motion does not actually exist in the universe; motion is entirely an illusion. Sounds completely crazy, right? In a world where we constantly see people walking, running, and kicking balls, how could anyone claim such a thing? Zeno tried to prove this precisely by using the concept of infinity at a point where logic and mathematics refused to bend. Let's look at his most famous example: Achilles and the Tortoise. Achilles (the legendary hero of the Trojan War, invulnerable except for his heel), the fastest runner of his time, gives a 100 meter head start to a very slow tortoise in a race. The race begins. Achilles runs and reaches the exact spot where the tortoise was (the 100 meter mark). But by that time, the tortoise has al...
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