The duration of menstruation varies according to the climate.

This is correct. In countries with distinct seasons, it has been shown that women experience more discomfort in winter. According to experts, there is greater ovarian activity in summer, resulting in shorter cycles.

When a group of women spend a lot of time together, their periods synchronize.

This sounds super romantic, but it’s not true. According to studies, simply being around other women doesn’t mean your periods will synchronize.

If I go in the water, my period will automatically stop.

Personally, I wouldn’t risk it. When you go in the water or take a bath, the flow of menstrual blood stops due to the temperature difference. However, some people believe that gravity stops the flow and makes it harder for the menstrual flow to be expelled.