When we see 2 but call 10?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

Why is a river so rich ?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

Can you find the six hidden animals in the picture below?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

A king sentenced a man to the death sentence for some crime he had committed. Known for his kindness, the king told the culprit that he had a choice to die in a way he decides.

The culprit was clever and said something that saved him from death. What method do you think he must have chosen for his death?

What word is pronounced the same if you take away four of its five letters?

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?