The quark structure of the proton. There are two up quark in it and one down quark. The strong force is mediated by gluons (wavey). The strong force has three types of charges, the so called red, green and the blue.
I, the author of this work, hereby publish it under the following license:
This file is licensed under the Creative CommonsAttribution ShareAlike 2.5 License. In short: you are free to share and make derivative works of the file under the conditions that you appropriately attribute it, and that you distribute it only under a license identical to this one. Official license