By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Which is faster, Heat or Cold ? Explain.

A woman is sitting in her hotel room and hears a knock at the door. She opens the door to see a man whom she’s never met before. He says, “I’m sorry, I have made a mistake, I thought this was my room.” He then goes down the corridor and into the elevator. The woman goes back into her room and calls security. What made the woman so suspicious of the man?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

This is a picture puzzle. You have to guess the name of the movie that can be related to the picture.

Can you find out which number multiplied by itself will give the output as 12345678987654321?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Do You See It?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

Can you make four (4) nines (9) equal 100?