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.

In a mathematical quiz, you are asked the following question:

Use three 9s in a mathematical expression without dividing or multiplying to form the number one.

Can you answer the question?

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

Where do fish keep their money?

You see me once in June, twice in November, and not at all in May. What am I?

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

What has 13 hearts but no other organs?

People put me on the table and cut me but do not eat me. What am I?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?