Can you start the fire using two pieces of wood?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

A man was going to bleach his socks because they had gotten muddy the day before. As he was pouring the bleach into the washing machine, he spilt some on the floor. He got some cleaning fluid and mopped it up with a rag. Minutes later he was dead. What killed him?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?

What has 13 hearts but no other organs?

What can you see in the middle of March and April that you can never see in any other month?

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?