In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

What number when divided in half becomes zero?

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

Can you place three balls such that the equation shown in the picture holds true?

What Deficiency does the below rebus represent?

VIT_MIN

Can you solve the below tricky visual equation?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?