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認爲，氡氣是美國肺癌的第二大原因，而找出家中是否存在高濃度的氡氣，可以像一個廉價的家庭測試工具一樣簡單。