Has the case against DDT been proven? A strange question, perhaps, to be asking one year after the US has banned the insecticide, but NOVA dares to ask. Tracing the history of DDT from its discovery through its banning in the States, NOVA asks whether America overreacted with its total ban of this once acclaimed "wonder" chemical.

NOVA explores T.D. Lynsenko's rise to power in the Soviet Union in the early 20th century, and how it affected plant genetic research in the USSR.