Solve below rebus puzzle?

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

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?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

How is the moon similar to a dollar?

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

Identify the hidden meaning behind this picture?

There is a place where if I stand up straight, I will still be considered sideways.

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?