Critical Thinking Puzzles

A grandfather is telling his grandson war stories. "At the end of World War 1, I was awarded for my bravery after saving a group of my ...

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing wa...

A millionaire bought a job lot of hats 1/4 of which were brown. He sold 2/3 of the hats including 4/5 of the brown hats. What fraction of th...

You have 2 hourglasses, a 7 minute hourglass and an 11 minute hourglass, what is the quickest way to time the boiling of an egg for 15 mins?

if a 0.1mm paper is folded 100 times then what will be the thickness of it after 100 foldings?

Would anyone know the shortest sentence in the English language that has every letter of the alphabet?

How many times are the hands of a clock at right angle in a day?