Be right or be dead

A barber's job is to shave every man in town who doesn't shave himself. Does the barber shave himself?

He does.

He doesn't.

Why do they sterilize the needles for lethal injections?

If φ(n) divides n − 1, must n be prime?

Yes.

No.

? هل الله موجود

نعم

لا

Tell me, voyager, what is simple, and yet also a riddle?

Why did kamikaze pilots wear helmets?

What is the meaning of life ?

Can a prime p satisfy 2p − 1 ≡ 1 (mod p2) and 3p − 1 ≡ 1 (mod p2) simultaneously?

Yes.

No.

Why do they put Braille on the drive-through bank machines?

What have I got in my pocket?

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