The method could forecast the end of a woman's period one to two years in advance of the menopause.
A link between psychosis and the menstrual cycle was first proposed in the 1800s.
In most states menstrual products are not sales tax-exempt, a category primarily reserved for food, prescription medications, and other "necessities of life."
Any vote against access to sanitary products is a vote in support of prison staff who dehumanize women in their custody by forcing them to subsist in blood-soiled clothes. Hardly country club activities.
During a hearing on a bill to make free tampons, sanitary pads and menstrual cups a right for Maine's female prisoners, Republican lawmaker Richard Pickett of Dixfield said that risked turning prisons into country clubs.
A city council in England issued guidelines to teachers of sexual-education courses that young students should be taught "all genders" can get their period.
Even when the source is extreme exercise or malnutrition, the process that stops women from getting their periods begins in the brain.
"It's women's excuse for when they need a break," Robyn Stein DeLuca said.
Will other brands follow suit and ditch the mysterious blue liquid for good?
Before millennial women started launching organic tampon companies, Kenneth Alvandi founded Maxim to offer women 100 percent organic tampons, pads and liners.
The movement to destigmatize menstruation has added a crucial ally: men.
The fight against period shaming has momentum in the U.S. and beyond, with states exempting menstrual products from sales taxes and menstrual equity awareness rising around the globe.
Women are choosing contraceptives that lessen or cease their monthly bleed.
Roshani Tiruwa was forbidden from sleeping in the family home because she was on her period.
While studying lions in Zambia, biologist Thandiwe Mweetwa noticed synchronised estrus cycles.
Women are still routinely left out of sports medicine research because they menstruate, argue a group of scientists.
Michelle Obama's Let Girls Learn initiative could be the perfect vehicle to create change for girls' education.
The film aims to educate women and the medical community about a prevalent but oft-misunderstood disease.
The creator, producer and star of "Girls" says she will rest rather than head out on the press circuit ahead of season 5.