<http://schema.org/about>
"The medieval physician Paracelsus said: \"Poison is in everything, and no thing is without poison. The dosage makes it either a poison or a remedy.\" Often quoted in paraphrase as the dose makes the poison, this truism has dominated"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/organic-beauty/no-safe-amount-the-handshake-theory-of-chemical-toxicity.html>