It’s been 75 years this month since the start of the Atomic Age, with the U.S. nuclear bombing of Hiroshima and Nagasaki killing hundreds of thousands of civilians, but its trail of destruction has never ended. DARK CIRCLE overs both the period’s beginnings and its aftermath, providing a scientific primer on the catastrophic power of nuclear energy while also relating tragic human stories detailing the devastating toll radioactive toxicity has taken on people and livestock—focusing in large part on Rocky Flats, Colorado, whose plutonium processing facility infamously contaminated the surrounding area. Documentary Grand Prize winner at **Sundance**.