Jack Sumner
... that Grand Canyon explorer Jack Sumner intentionally castrated himself?
... that <a href="./Grand_Canyon" id="mwww" rel="mw:WikiLink" title="Grand Canyon">Grand Canyon</a> explorer <b id="mwxA"><a href="./Jack_Sumner" id="mwxQ" rel="mw:WikiLink" title="Jack Sumner">Jack Sumner</a></b> intentionally castrated himself?