What is always in front of you but can’t be seen?

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

What does does this rebus picture means ?

Can you find out the remainder when 3^300 is divided by 5?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Paul's height is six feet, he's an assistant at a butcher's shop and wears size 9 shoes. What does he weigh?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

There are three boxes. One is labeled "APPLES" another is labeled "ORANGES". The last one is labeled "APPLES AND ORANGES". You know that each is labeled incorrectly. You may ask me to pick one fruit from one box which you choose.

How can you label the boxes correctly?

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