But he acknowledged that coming down the stretch in contention for a first major title would be a sterner test of his emotions in the wake of his father's passing.

BBC: SPORT | Golf | Harrington looks to new beginning

Decades after the event, nearly half of those who did not pass the grammar school entry test said it brought back negative emotions.

BBC: Middle age begins at 55 years, survey suggests

Students are never taught how to regulate their emotions or study for a test.

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Researchers then conducted a behavioral test in which participants separately breathed the "exercise" sweat and the skydiving "stress" sweat while judging the emotions conveyed in pictures of faces on a computer screen.

CNN: Sweat may give off stress signals, study says