Why is a river so rich ?

What is the riddle which can be asked all day with a different correct answer each time.

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

During an interview, the interviewer ordered hot coffee for the candidate to relieve the stress. The coffee was kept before him. After a minute, the interviewer asked him, 'What is before you?' He replied 'Tea'.

The candidate was selected immediately. Why?

How many triangles can you find in this given picture?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

Eight of us go fourth, not back, to protect our king from an attack. What are we?

What makes this number unique: 8,549,176,320?

What does this Rebus Picture means ?