Which is heavier: a ton of bricks or a ton of feathers?

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 was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?

Replace the question mark with the correct number below.

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?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

You need to arrange three 7 and mathematical symbols to form number 1?

What English word has three consecutive double letters?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

What does this rebus picture identify?