What has 13 hearts but no other organs?

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

You walk into a room and see a bed. On the bed, there are two dogs, five cats, a giraffe, six cows, and a goose. There are also three doves flying above the bed. How many legs are on the floor?

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?

Move four matchsticks to the below square to form three squares?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

I add 5 to 9 and get 2. The answer is correct, so what am I?

Find the number of squares in the below-given picture.