Critical Thinking Puzzles

On a 12-hour digital clock, what is the smallest interval between two times that are palindromic (can be read forwards and backwards as th...

I just found a number with an interesting property: When I divide it by 2, the remainder is 1. When I divide it by 3, the remainder is 2....

There is an island with 12 islanders. All of the islanders individually weigh exactly the same amount, except for one, who either weighs mo...

There are 100 employees in a conference room in New York City. You note that 99% of them are managers. How many managers would need to leav...

"I'm a very rich man, so I've decided to give you some of my fortune. Do you see this bag? I have 5001 pearls inside it. 2501...

A person dies, and he arrives at the gate to heaven. There are three doors in the heaven. one of them leads to heaven. another one leads to...

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?