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.

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

You bought me for dinner but never eat me. What am I?

Find the Goldfish below the given Image.

If eleven plus two equals one, what does nine plus five equal?

There was a strange boy who was born before his father. How can this be possible?

Can you count the number of squares in the figure below?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

What does the below rebus riddle means?