Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

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?

Which digit occurred maximum times between the number 1 and 1000?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

Count the Triangle in the figure given below:

When it is alive we sing, when it is dead we clap our hands. What is it?

Can you count the number of blocks in the picture below?

I am the fastest animal but cannot climb the tree. What am I?