Also: Preserved hair reveals just how bad lead exposure was in the 20th century ...

		krunck 3 months ago \| parent \| context \| favorite \| on: Banning lead in gas worked. The proof is in our ha... Also: Preserved hair reveals just how bad lead exposure was in the 20th century (livescience.com) - https://news.ycombinator.com/item?id=46872282