How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

Which is faster, Heat or Cold ? Explain.

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?

What four weights can be used to balance from 1 to 30 pounds?

How can one talk without saying a single word?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

Which of the below owl is odd one out?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?