Summary: For years, women in China’s Xuan Wei County in Yunnan Province — women who never smoked cigarettes — have been plagued by lung cancer. The mortality rates among female nonsmokers are the world’s highest — up to 20 times higher than average in China. A new study sheds light on the cancer epidemic and points to an unlikely source: volcanic eruptions occurring millions of years ago. Intro theme and music by Kevin MacLeod. Creative Commons licensed audio from freesound.iua.upf.edu.
