Why was the quark theory first proposed?

Related questions

1. How do particle accelerators work?
2. Why is parity not conserved in beta decay?
3. Why are they called quarks?
4. Can the hadron collider create a black hole?
5. What is the CP?
6. What is CP value?
7. How did they find quarks?
8. What are the 12 fundamental particles?
9. What does Higgs boson prove?
10. What's inside a quark?

Tags

1. #physicists
2. #subatomic
3. #constituent
4. #hadrons
5. #strongly
6. #particles
7. #important
8. #independently
9. #explained
10. #within
11. #quarks
12. #properties
13. #proposed
14. #framework
15. #existence
16. #interacting
17. #could
18. #known