Harvard chemist George Kistiakowsky was an anti-Bolshevik soldier in 1919 Russia, an atomic bomb scientist at Los Alamos, a presidential advisor in the Eisenhower White House and an arms control activist. Shortly before Kistiakowsky death, he recounts his eventful career to interviewer Carl Sagan.

All over the world, farmers are taking more from the soil than they return. NOVA reports on the soil crisis in world agriculture—a plight that has already resulted in massive starvation.