What is in seasons, seconds, centuries, and minutes, but not in decades, years, or days?
I cannot be felt, seen or touched; Yet I can be found in everybody; My existence is always in debate; Yet there is a style of music named after me.
If you are unsure how to use one then just ask a flight attendant.
In many hallways you would stand, if not with this in hand.
Nothing specific, but more than a few. This many clustered, together will do.
Break it and it gets better, immediately set and harder to break again.