Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

To attend world science seminar, A famous chemist from Mexico visit
London. In the lab, the scientist was killed and his six assistants were under suspicion of killing the chemist.
Name of six assistants: Austin, Wayne, Dege, Oscaru, Lingard, and Rojo.
He left a note "76-20-44 79-16-22-7"

A local detective Jack was called to solve the case,

After reading the note, Jack instantly asked the police to arrest the murderers.

Who are the murderers?

Can you count the number of triangles in the given picture?

How many runs at maximum can a batsman score in a normal one-day match? Consider the fact that the conditions are ideal and there are no No Balls, no Wide Balls and no Extras in that match.

What does this Rebus Picture means ?

What is next number in the pattern below:

131 517 192 123 ?

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

Solve the rebus riddle in the picture below.

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?