Why hide the Philosopher's stone behind solvable puzzles?
39402
Was the Sorcerer's (Philosopher's) Stone really that well protected?
92147
Coin sequence paradox from Martin Gardner's book
10255
Paradoxes without self-reference?
2786
The staircase paradox, or why $\pi\ne4$
11296
The Monty Hall problem
146555
In Grover's Algorithm, does the exact solution need to be given to the oracle?
115749
Java Puzzler- What is the reason?
138876
Why are some muggles allowed to know of the magical world?
126908
Is it possible for an encryption method to exist which is impossible to crack, even using quantum computers?
107110
Solving Rubik's cube and other permutation puzzles
158281
100 blue-eyed islanders puzzle: 3 questions
69823
Why did Dumbledore make it less difficult to get to the Sorcerer's Stone?
50258
How can a set contain itself?
136259
Does the Simulation Argument differ in essence from the Evil Genius puzzle?
149947
hide proof environment for restructuring
147556
Express logic puzzles with proposition calculus notation
108488
Why aren't vacuous truths just undefined?