In my opinion the life is first of all
energy + matter.
Take the simplest atom hydrogen: electron+proton.
This atom is primary particle for farther material evolution.
We don't know what an electron is.
''We know electron by what it does, not by what it is''-
- somebody wrote.
We don't know where proton come from.
Life is*also five senses plus the thought.
The analysis* of the senses + thoughts shows that
they psychologically very subjective conceptions.
But somehow modern science were created by
objective laws and thoughts.
Now try to explain the puzzle: what is life?