Keyboard words are not in alphabetical order, Why?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

What is red and smells like blue paint?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

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

Rearrange the letters in "new door" to make one word.

Move four matchsticks to the below square to form three squares?