What has 13 hearts but no other organs?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

By moving just one matchstick, you need to make the below statement true. Can you do it?

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

2, 3, 5, 9, 17, _ What is the next number in the sequence?

I travel all around the world but always stay in the corner. What am I?