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.

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

1. What does:
TIM JOB
represent?

2. What does:
MO_ _
represent?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

When can we add 2 to 11 and get 1 as the correct answer?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?