You can see it everyday, But cannot touch it at will. What is it?

A man is found dead in his bathroom naked with blood scattered all around him. The bathroom was locked from the inside and there is no trace of any struggle. There is nothing in the bathroom except his pant with the belt still around and his shirt. Also, the medic team can't find any incision in his body that may have been the reason behind so much blood loss.

The Police department is clueless regarding this murder mystery.
Can you?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

Keyboard words are not in alphabetical order, Why?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

The answer I give is yes, but what I mean is no. What was the question?