Kendall, Henry Way (1926-1999), an American physicist, worked with Jerome Friedman of the United States and Richard Taylor of Canada in experiments that proved the existence of subatomic particles called quarks. In the early 1970's, the three scientists fired particles into the heart of the proton and neutron, the two particles that make up the nuclei of atoms. They found that each proton and neutron is made up of three quarks. For these discoveries, the three scientists shared the 1990 Nobel Prize in physics.