How do girls become... "in-sync"?

I doubt frequent guys will know the answer to this... but it's something I'm really interested in. Why do girls who live together, or spend alot of time together... become synchronised in their menstrual cycle?

I nouns retarded, I know
Answers:

Is this possible??

It have to do beside pheromones/hormones, some articulate it is also tied to the lunar cycle. The most dominant feminine will organize the others to enjoy indistinguishable cycle.

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No this isn't retarded. It can and does develop.
I'm not sure medical science have an answer to this on the other hand, but my idea is we become sensitive to the other those hormones.

Swimming and time?

yes, it does begin, because the girls tend to guzzle impossible to tell apart foods, same sleeping rota, same amusement calendar, etc. outside factor affect spell timing, and if adjectives the factor are one and the same or close to it, its possible to synchronize. bodies are adjectives different as expected, so idk if it'd work if influence youre a tiny girl and your friend is a large chick.

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I saw a show roughly this. It have something to do beside pheromones within our body.

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It does happpen and womanly bodies do it conscious. It's done so that the group of women are smaller number expected to find pregnant by one and the same man. If they adjectives ovulate at different times the dominant masculine could basically move from one to the other to the other, getting them adjectives pregnant, which isn't virtuous for genetic diversity. If adjectives the women ovulate at equal time they are more probable to twosome up beside different men.