I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

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

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

A woman shoots her husband.

Then she holds him under water for over 5 minutes.

Finally, she hangs him.

But 5 minutes later they both go out together and enjoy a wonderful dinner together.

How can this be?

Look at the picture and find out which square is not linked with any of the other squares.

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?