50 years ago, scientists were on a quest for quarks
Excerpt from the February 13, 1971 issue of Science News
In the last 50 years, physicists discovered that particle building blocks called quarks exist and come in many varieties and combinations (a five-quark particle is shown in this artist’s illustration).
CERN
More about partons — Science News, February 13, 1971
Experiments in which protons and neutrons were bombarded with high-energy electrons have given indications that protons and neutrons are not amorphous masses but composed of distinct subparticles.