Which is faster, Heat or Cold ? Explain.

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

How can a man go eight days without sleep?

81 x 9 = 801. What must you do to make the this equation true?

In the image below, can you find the value of an angle(y)

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

Suppose you are a girl candidate and sitting in an interview. Suddenly the interviewer asks you, 'What if one morning you wake up and find out that you are pregnant?

How will you reply to such a question?

Can you find out who is the kidnapper in below Picture and why, Explain ?

The host of a game show, offers the guest a choice of three doors. Behind one is a expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?