One new study found that radiation exposure didn't genetically harm future generations, while another offers insights into how radiation causes thyroid cancer. //

On this day in 1986, workers ran a safety test at the Chernobyl Nuclear Power Plant in northern Ukraine. But the test went awry, starting a fire in a reactor and leading to one of the largest nuclear disasters in history. Smoke from the fire and a second explosion launched radioactive elements into the atmosphere, scattering them over the surrounding fields and towns. Now, 35 years later, scientists are still uncovering the extent of the damage and starting to answer questions about the long-term legacy of radiation exposure on power plant workers, the people in the nearby community, and even their family members born years later.