einsteinium
... that the chemical element einsteinium was discovered in the debris of the Ivy Mike nuclear test in 1952?
... that the chemical element <b id="mwBGc"><a href="./Einsteinium" id="mwBGg" rel="mw:WikiLink" title="Einsteinium">einsteinium</a></b> was discovered in the debris of the <a href="./Ivy_Mike" id="mwBGk" rel="mw:WikiLink" title="Ivy Mike">Ivy Mike</a> <a class="mw-redirect" href="./Nuclear_test" id="mwBGo" rel="mw:WikiLink" title="Nuclear test">nuclear test</a> <i id="mwBGs">(pictured)</i> in 1952?