Why is 6 afraid of 7?

Spot 5 differences in two Christmas tree below:

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.

A girl was standing near the window thinking something. All of a sudden she decides something and throws something out of the window. She dies very soon after throwing it. She was perfectly healthy and had no disease or allergy. No one killed her and she did not commit suicide.

Can you think of any possible explanation that is logical as well for what happened there?

What has a ring but no finger?

A blonde put eyeliner on her head. Why?

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

There was a strange boy who was born before his father. How can this be possible?

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

If two's company, and three's a crowd, then whats four and five ?