Echoes of Extinction

Scientists have been mystified for two decades by a huge spike in lung cancer rates among women in a remote region of China. Their suspicion was that it was somehow related to the coal that was being burned in unventilated stoves to heat and cook. This practice has been common in China, but why would cancer rates be so much higher – twenty times higher – only in this region?

via CBC Radio | Quirks & Quarks | Jan. 16, 2010.