Because three hundred qualified people applied for one of the three radioisotope courses offered during the summer, whereas only ninety-six students could be placed in all three, the Oak Ridge Institute of Nuclear Studies has scheduled four additional courses for the fall and winter months. Additional information and application blanks may be had from Dr. Ralph T. Overman, Oak Ridge Institute of Nuclear Studies, Post Office Box 117, Oak Ridge, Tennessee. Another note in this expanding field is the announcement from the Atomic Energy Commission that more than a hundred research institutions and hospitals in fifteen countries are now using radioisotopes, principally in medical and biological work. Twenty-one nations made arrangements to receive radioisotopes in the first year they were shipped abroad from the Oak Ridge pile.