Speaking ahead of his arrival as the host of returning series Jeopardy! the broadcaster, 67, explained that the psychological side of quizzing is as important as any obscure fact.
The Ukrainian Geological Survey last year claimed that the war-torn country had reserves of rare minerals - but US scientists made no mention of sought-after earths in their own survey.
It's a familiar puzzle that many of us face on an almost daily basis. When nature calls and your only option is a public toilet, which cubicle should you pick?
A breast cancer diagnosis is almost always followed by invasive biopsies, surgery, radiotherapy, chemotherapy and hormone treatments.
But could all that be set to change?
Under current UK guidance, treatment to tackle the early stage cancer involves surgery which may then be followed by radiotherapy to kill off any abnormal cells lurking in the breast tissue.