The mathematician's nightmare! Noah's trying to load his ark with prime numbers, but someone snuck in 91 (which is 7×13). The look of betrayal on his face is priceless. Prime numbers can only be divided by 1 and themselves - they're the building blocks of mathematics. But 91 is an impostor among the primes, wearing a disguise so convincing that even experienced math enthusiasts occasionally fall for it. And there's 13 looking all smug about it. "Yes, I multiplied with 7 behind your back. What are you going to do about it?" Next time you're building an ark of prime numbers, double-check your passengers with a primality test!
The Prime Number Ark Catastrophe

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