Zachary Elliott
@zaelefty
Founder of @PdxInstitute. Restoring reality in science education. Author of three books. Producer of animated videos, articles, and books on sex and gender.
I present my new book on debunking the sex spectrum! Order now on Amazon! I tackle 10 common sex spectrum arguments and teach the reader how to respond with detailed knowledge from evolutionary and developmental biology literature. amazon.com/Binary-Debunki…

Clownfish can change sex. Humans cannot, no matter how many hormones or surgeries are involved. Here’s the biology that should be taught in school.
Ask yourself why they would place XX male syndrome (which results in full male development--testes and a penis) further to the "female" end of the spectrum than XX Congenital Adrenal Hyperplasia (which results in full female development--ovaries, Mullerian ducts, etc). This…
sex is amazingly complex and this chart from scientific american in 2017 is a great visualization of how complex sex is. it still only just barely scratches the surface of sex as it focuses on cıssex and a few intersex sexes on the bimodal spectrum of sex
What’s a biology topic you wish you had learned earlier in life?
Did you know that all our sex hormones (testosterone, estrogen, and progesterone) ultimately originate from cholesterol?

“The sex spectrum moral framework captures people’s compassion, empathy, and virtue and twists it for political gain. People who are sensitive to the feelings, emotions, and experiences of others, especially to those who are deemed victims or vulnerable minorities of society, are…

From our research, because of my own endometriosis and PMDD issues, we've started finding a correlation between glutamate and GABA production/reception/conversion and how the normal cycle levels impact them. In people with childhood trauma, PTSD, or some other issue that affects…
What’s a topic in biology that confuses you the most or is the most difficult to understand?
Let us note that the female seahorse has to transfer her eggs because she is the one who actually produces them. Please never fall for the seahorse gambit 🤓
A female seahorse transferring her eggs to a male seahorse.
ICYMI: Here is our fascinating interview with Helen Joyce! @HJoyceGender. youtu.be/J3ywIxGcLQE?si…
Chromosomes are not the definition of sex. But they do determine sex, as in triggering development down a male or female path—specifically, the genes inside them.
I'm currently working on a major educational project on DSDs. I will be announcing it soon! But first, what DSDs would you like to see included?