<a href="https://en.wikipedia.org/wiki/Martin_Kamen" id="mw3w" rel="mw:WikiLink" title="Martin Kamen">Martin Kamen</a> and <a href="https://en.wikipedia.org/wiki/Sam_Ruben" id="mw4A" rel="mw:WikiLink" title="Sam Ruben">Sam Ruben</a> discover <a href="https://en.wikipedia.org/wiki/Carbon-14" id="mw4Q" rel="mw:WikiLink" title="Carbon-14">carbon-14</a>.