Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

A father's child, a mother's child, yet no one's son.

Who am I?

Can you place six X (crosses) in below board without making three in a row in any way ?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?

What does below pictogram mean?

Can you make a six-letter word using the letters N, A and B ?

What is the next number in this matchsticks series riddle?

If EELS + MARK + BEST + WARY = EASY

What does HELP + BARK + WARD + LEAD equal?

What is full of holes but still holds water?