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?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

What is next number in the pattern below:

131 517 192 123 ?

What can go through glass without breaking it?

What does below chemistry rebus means?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

Can you make the number 24 by utilizing the numbers 1, 3, 4 and 6? You must use one number only one time and you can use mathematical operation symbols anytime anywhere.

What word is identified by the below rebus?

Your Your Your Your Your
Your Your Your Your Your

Why did Navjot Singh Sidhu put the new January calendar in the freezer

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?