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.

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

Can you find a five letter word that is left with only two letters if one is removed?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

There was a kingdom in which the king had no heir to take over his thrown. Even the queen was dead and he himself was on the verge of dying. He thought about it and then summoned all of the teenagers. He gave one seed each to all of them and asked them to grow the plant. He announced that the one with the most beautiful plant will become the king/queen of the empire after the death of the king.

After a month, all of them were called. The king looked at all of the plants but announced the girl with an empty pot as the queen of the empire. Why?

Can you make a fire with just a single stick?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

How can you make number one disappear by adding something to it?

What is common among 11, 69, and 88?