Here is an amazing fact about human body: On average, menstrual cycle is 28 days, from the first day of menstruation to the first day of next cycle. But the menstrual period of those women who are close friends or live closely together, for example in a dorm, gradually synchronizes (occurs at the same time).
While there is some debate over “menstrual synchrony”, but Pheromones (Airborne chemical signals) and sense of smell are believe to be responsible for this interesting phenomenon.

Headache
Are You Suffering From Migraines And Headaches? It Might Be Caused By THIS Vitamin Deficiency
People who regularly suffer from migraines and headaches know how debilitating they can be. Though pain medications can be a short term solution, it is