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We are two sisters.
Our difference is your best key.
I am probably the bigger one
and everything I’m not,
is she.
We have always opposite opinions,
the reason of our loud fights.
And if I start a quarrel with my sister,
surely, you’ll see and hear
our spites.
The root of our conflict is quite old.
(Yes, we’re born in weird family.)
As kids we fought once, so I’m told.
And then what’s left was
only me.
It sounds like you're thinking of
a quantity of matter and a smaller mass of anti-matter.
Two sisters, difference, everything I'm not:
Matter and anti-matter are related but opposite.
The bigger one:
In your puzzle, there's more matter.
Opposite opinions, loud fights, quarrel, hear:
Matter and anti-matter have opposite properties and react energetically to each other.
Root of conflict, family, fight, remainder:
When matter and anti-matter react, they annihilate an equal amount of each other, so some of the initially more massive type will remain after the other has been completely used up.
