Take a journey with NSWA Board Member Wudan Yan to Semipalatinsk, Kazakhstan. In a news feature for Nature, Wudan describes how radiation exposure from Soviet-era nuclear tests still affects the local population. She documents the effects on multiple generations of residents and explains what the medical records of people in the region mean for public health research. To read about Wudan’s next reporting trip, follow @wudanyan and see wudanyan.com. image: CIA