Confinement is the physics phenomenon that quarks cannot be isolated. The color-charged quarks are confined with other quarks by the strong interaction to form pairs or triplets so that the net color is neutral. The force between quarks increases as the distance between them increases, so no quarks can be found individually.
... the Republican side of the Spanish Civil War.
Resistance groups also helped Allied pilots who had been shot down to get back to Britain. They minimized the threat of ...