How many times do a clock's hands overlap in a day ?

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?

You bought me for dinner but never eat me. What am I?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

How many Watermelons are there in the below picture?

I know a nine-letter word having only one vowel.
Do you ?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

What has to be broken before you can use it?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

John was born on March 5, 1970, in Delhi, India. Jacob was born 25 days before John. The year when they took birth, Republic Day fell on Monday.

Can you find out on what day was Jacob born?