TIL that marble countertops are radioactive and can emit radon gas
https://www.epa.gov/radtown/natural-radioactivity-building-materials#:~:text=Building%20materials%2C%20such%20as%20brick,radon%20levels%20in%20your%20home.
https://www.reddit.com/r/todayilearned/comments/162n0sx/til_that_marble_countertops_are_radioactive_and/
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