YSK that radon gas is the second leading cause of lung cancer in the US, and finding out whether it is present in high levels in your home can be as simple as a cheap home testing kit.
from /r/YouShouldKnow
YSK认为，氡气是美国肺癌的第二大原因，而找出家中是否存在高浓度的氡气，可以像一个廉价的家庭测试工具一样简单。