What is quantum tunneling?

Because we can readily observe macro objects, and by observing them we have given them a location. On the subatomic level, at which we cannot observe the particles readily with the naked eye, the superpositions are not restricted and can cause some amazing effects. The act of observing a particle changes its current state, and I don't know about you but I can't observe them by myself. You should look up the double split experiment, in which observing electrons changed their behavior.

@farshad94abedi Its fine, keeping it simple is the best way.

very poor animation used to make us understand this, i can understand it but it would hav had made it more interesting if it had better aanimations then just a red pixled tingy and a line, lol

if it appears to be in front of you it could appear behind you is

if like in the vid quantum mechanical phenomena can cause effects on large objects like the sun why is it difficult to fuse it with relativity where the theory works well only with macro objects

what raquette ball?

Heinsberg Uncertainty principle.

Can I remind you that Schroedinger by himself was deeply disappointed by the probability interpretation of his equation. Probability interpretation is very useful in quantum mechanics, but not absolutely necessary. About the ball and the table:
Maybe if all the atoms of the ball somehow moved coherently with those of the table (also moving in the same way ), then it would be not a great problem for the ball to tunnel through the table.

Its good that nature is neither here nor there. More possibilities :)

Not hard, it's just not correct.

Imagine a static universe of the color green which goes on forever in time and space.  It is both infinite and not full of every possibility.

Read Dcolarusso's posts.