Toxin Facts

Indoor air pollution is typically 2 to 5 times more concentrated than outdoor air pollution, and in some cases can be up to 100 times worse.

A BBC documentary captured footage of dolphins gently chewing on puffer fish and passing them around, behavior that filmmakers believe may be the dolphins seeking a mild intoxicating effect from the fish's toxins.

The most toxic substance known is botulinum toxin, the substance used in Botox. One hundred nanograms is enough to kill a fully grown man; a kilogram could theoretically kill more than a billion people if perfectly distributed.