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Women are considered to have hit menopause when they haven’t menstruated for a year.

“When I was in the emergency ward, there was no toilet. We couldn’t go to the loo during 14-hour shifts. Even when we were menstruating, we couldn’t use a toilet.”

Women also have humanity’s only obvious connection to the mechanics of the universe: They menstruate according to the moon.

When Prof Gravholt asked her why she didn’t consult a doctor about not getting periods, she said there was another older woman in her family who never menstruated - so she thought it wasn’t abnormal.

They felt worse when menstruating and thought their performance would suffer - but on average, they were 12% faster at ball-moving tasks and 25% more likely to pass a test of their anticipation skills.