 Parameters of the Standard Model

The growing number of parameters of the Standard Model is one big source of worry for early 21st century physics, much like the growing number of particles was a worry in the beginning of the 20th (but that one was solved by 2020).

List: en.wikipedia.org/w/index.php?title=Standard_Model&oldid=1042518939#Construction_of_the_Standard_Model_Lagrangian