polonium-210
... that polonium-210 is 250,000 times more toxic by weight than hydrogen cyanide?
... that <b id="mwIA"><a href="./Polonium-210" id="mwIQ" rel="mw:WikiLink" title="Polonium-210">polonium-210</a></b> is 250,000 times more toxic by weight than <a href="./Hydrogen_cyanide" id="mwIg" rel="mw:WikiLink" title="Hydrogen cyanide">hydrogen cyanide</a>?