Entire French population contaminated with heavy metals, study warns
Russian police detain Kremlin critic Navalny on return to Moscow
France confirms Novichok poisoning as Navalny allies make gains in Russia vote
Nato demands probe into alleged poisoning of Navalny by Novichok
Berlin doctors say tests indicate Putin critic Navalny was poisoned
Fears over arsenic poisoning in Vietnam's water deltas
Fifth victim dies in Hungarian toxic sludge disaster
Lead poisoning kills 400 children in Nigeria
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