What has 13 hearts but no other organs?

What does below Rebus mean ?

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You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

Can you move 2 matchsticks to form four equal sized squares.

What does below pictogram mean?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

Why is the longest human nose just 11 inches?

What has many teeth, but cannot bite?

If an electric train is travelling south, then which way is the smoke going?

I have no life, but I can die. What am I?