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Three Surprising Questions About Periods

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Published on Feb 10, 2016

In honor of Valentine’s Day, I’m celebrating the 10s of millions of people who will be menstruating on the Hallmark holiday.
What should you do if you have your period in the field? Check out Emily’s video on The Brain Scoop! https://youtu.be/jjFZ1nzijrI
Subscribe! http://bit.ly/1FkxVLb ‖ Twitter! https://twitter.com/gross_science ‖ Tumblr! http://grossscience.tumblr.com/
↓Want more info?↓

Paper on proteins in periods:
http://1.usa.gov/1QrzJ4L

LiveScience on why menstruation remains a medical mystery:
http://bit.ly/1PD17x0

Francie Diep writing for PopSci on why you poop more when you have your period:
http://bit.ly/20oMYIC

Regarding the section on how menstruation evolved, as I indicated in the video, this is one hypothesis. Here’s more info on it, along with other ideas:

Paper on the hypothesis I discuss about why menstruation evolved:
http://bit.ly/1msFqaw

Pharyngula on the mother-fetus conflict hypothesis of how menstruation evolved:
http://bit.ly/1PNJvC2

Paper on energy economy in the evolution of menstruation:
http://bit.ly/1QVOXlb

BBC article that addresses multiple hypotheses for the evolution of menstruation:
http://bbc.in/1KFFE9B

Also, a note: In this piece, when I say menstruation, I’m referring to “overt menstruation,” where the lining is shed and then expelled from the body. Some people use the term “covert menstruation” to talk about animals that have “estrous cycles” and reabsorb their endometrium.
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Host, Writer, Editor, Animator
Anna Rothschild

Additional Research and Writing
Karishma Desai

Many thanks to Dr. Kathryn Clancy and Dr. Deena Emera.

Also, special thanks to Vanessa Hill, Joe Hanson, the entire PBS Digital Studios team for the awesome brainstorming session, Seeta Joseph, Allison Eck, Greg Kestin, and Jeffrey Wood.

Bad
Music Provided by APM

Original Footage and Animations
©WGBH Educational Foundation 2016

Footage and Images

Lady Parts Cross Stitches
Courtesy WhittyB
To purchase the patterns, visit her Etsy shop: http://etsy.me/1K81Klb

Female Scientist Examining Erlenmeyer Flask With Red Liquid Hd
Pond5/motion_poland

Color SEM of uterus endometrium (secretory phase)
Professor P.M. Motta & E. Vizza / Science Photo Library

Phylogeny
Courtesy Dr. Deena Emera

File:Schimpanse Zoo Leipsig
Wikimedia Commons/Thomas Lersch

File:Pallas’s long-tongued bat
Atsme (Betty Wills)

File:Eastern Rock Elephant Shrew
Wikimedia Commons/Marktittley

File:Do i look funny or something
Wikimedia Commons/Emily Killian Molina from austin, United States

SFX

Cockroaches
Freesound/StateAardvark­
(used with permission from author)

Squeak Pack/squeak_10
Freesound/Corsica_S

Pencil_check_mark_2
Freesound/jakobhandersen

Short Fart_01
Freesound/DSISStudios

Gross Science is produced by WGBH for PBS Digital Studios

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