According to an article in today's "Wall Street Journal," physicists are still struggling to understand the basic proton. In the 1960's, they determined that the proton was made up up three particles they called quarks. Unfortunately for them, the quarks only account for 1.5% of the mass of the proton, 20% to 30% of the proton's spin, and one-third of the proton's magnetism. The physicists have therefore added gluons (to keep the quarks together) and virtual quarks (quarks that pop into and out of existence) to their theory. Yet, these additional particles do not solve the problems in the least. Ultimately, the physicists do not know why the proton is a proton. God is still the God which "doeth great things and unsearchable; marvellous things without number" (Job 5:9). If some day they figure out what makes up the proton, they can then begin their search to understand what makes up a quark. [information taken from "Scientists Try to Put Right Spin on Quarks to Understand Matter" in WSJ, May19, 2006]
