Henri Picciotto: Can you solve the fortress riddle?

Can you solve the fortress riddle?

Bad news: your worst enemies are at the gate. Your fledgling kingdom guards the world's only herd of tiny dino creatures. To you, they're sacred. To everyone else, they're food. The three closest nation-states have teamed up to smash open your walls and devour the herd. Can you build fortifications for your kingdom before the siege weapons arrive? Henri Picciotto shows how. [Directed by Igor Coric, Artrake Studio, narrated by Addison Anderson].

A kingdom protecting the world's only herd of tiny dino creatures faces an alliance equipped with destructive siege engines. The only hope is to build a wall segment of the one length that no combination of enemy weapons can destroy. Using an approach inspired by the sieve of Eratosthenes, a method first used to find primes in ancient Greece, the solution reveals that a 43-meter wall is impregnable. This blend of logic and history transforms a life-or-death puzzle into a masterclass in mathematical thinking.