2 · en
Short, simple sentences with “quarks”, suitable for children and primary/elementary school, with common expressions and related words. You'll also find examples for middle and high school.
Matter is divided into two classes: leptons and quarks, analogues of electrons and protons. But in certain cases matter does not listen and theories mutate. Members of the same material family - such as protons and quarks - transform (radioactive decay can transform neutrons into protons).
While searching for the unifying theory of the laws of the universe, physicists realised - hypothetically - that the quarks inside the proton sometimes transform into leptons, causing the proton to disintegrate. But then this should have been going on for billions of years, and since matter is still abundant - although it is not known for sure if it is as abundant as it was then - the theory would be wrong.
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