I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

There is an exact a week gap between Christmas and New Year. Hence, It is obvious that the new year that comes right after Christmas comes on the same day of the week.

A Strange thing happened in the Year 1777. Christmas occurs on Wednesday and New Year on Monday. How is that possible?

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

I travel all around the world but always stay in the corner. What am I?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

Outside a tattoo artist's shop, there was a signboard which read 'I make tattoos on only them who do not tattoo themselves'.

Reading it what do you think, does the tattoo artist tattoo himself?

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