epa.gov

OG9A6 TIL mercury is released into the air by human activity, and can travel thousands of miles and settle into the ocean where microorganisms convert it into methylmercury, a highly toxic form that builds up in fish & shellfish.
9wrNm TIL: Invisible and odorless, radon gas is the #2 cause of lung cancer, killing 21,000 annually in the US. Despite its dangers and simple testing, a lack of regulations and awareness means many homes go untested, exposing countless to this silent killer.”
epPZL TIL You shouldn't use hot top water to drink or cook with, as it it much more likely to contain greater amounts of lead