Restoring biological reality to science education through bold, visual media. Founded by Zachary Elliott @zaelefty and Cynthia Breheny @PTElephant.

Joined February 2020
50 Photos and videos
Our founder and CEO, Zachary Elliott (@zaelefty), made important contributions to the language of this legislation and his testimony was instrumental in getting it passed by the Senate and it's now on the way to the House! We are very optimistic! 🎉
BREAKING: Indiana just passed SB 182 - Establishes 2 sexes, male & female - require prisoners be incarcerated based on sex - requires birth certificates state biological sex, M or F - require school bathrooms and locker rooms be based on sex Not a single Democrat voted for it.
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Wherever you may be and however you're spending your day today, we at Paradox hope it finds you in good health and good spirits. ⛄️❄️🎄🎅
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Paradox Institute retweeted
The Sex Development Handbook is a top bestseller, sitting at #2 in Embryology. It's currently on sale for 20% off. Get your copy before the end of December, and learn how males and females develop, from typical development to 25 DSDs. Order on Amazon: a.co/d/0oAdpnm
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📖🧐🤔 🫡🤓✔️
Do any of our other books include scientific citations? Yes, in fact, all claims in the books are cited with in-text citations from the primary scientific literature. Sex Differences: A Land of Confusion 70 pages Around 100 citations The Gender Paradox 500 pages Around 600 citations Binary 213 pages Around 300 citations The Sex Development Handbook 95 pages Around 150 citations
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Paradox Institute retweeted
Our beautiful new book by @PTElephant teaches children how males produce sperm, females produce eggs, and how these gametes join to start a new organism across humans, other animals, and plants. Age-appropriate. Biology-focused. Order at 🔗 itallbeginswithtwo.com
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Paradox Institute retweeted
We present our new series, Paradox Proofs. This first episode debunks the common myth that we all begin female. Learn why it's wrong, step-by-step, in just 3 minutes.
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Paradox Institute retweeted
Great art elevates the beauty of life. Our new children's book by @PTElephant on male and female does just that. You'll want to pick this one up for Christmas! 🔗 theparadoxinstitute.org/prin…
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We do not all begin female. We begin genetically sexed and physically undifferentiated. In 3 minutes, learn the science behind why the "we all begin female" myth is wrong! youtube.com/watch?v=aHtqzfp1…
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Paradox Institute retweeted
Watch @PTElephant and I discuss the denial of biology and our work at the Paradox Institute! Also, comment “Two sexes” under the broadcast post to have a chance at winning a free copy of our beautifully illustrated children’s book on male and female by @PTElephant.
COURAGE AFTER DARK - November 30, 2025 x.com/i/broadcasts/1LyxBXrkW…
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Happy Thanksgiving and/or Thursday, as it applies to you! 💫 Either way, if a family member starts an awkward discussion over dinner today, make sure you have science on your side by referencing any of the videos on Paradox Institute's YouTube channel! 😉 youtube.com/@ParadoxInstitut…
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Paradox' president isn't the only one with a new book out! Our founder and CEO, Zach Elliott, has a fresh release in the form of The Sex Development Handbook. It pairs well with his previous book, Binary, to give a nice overview of the science of how the sexes come to be.
Great companion books to buy or gift this holiday! The first teaches how the sexes are universally defined in biology. a.co/d/3KQYZ7j The second teaches how the sexes develop in humans, from a single cell to a fully grown male or female. a.co/d/7VdpzFG
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We're thrilled to announce the new science-based educational book by Paradox President Cynthia Breheny, "It All Begins with Two!" Loaded with beautiful art and beautiful science, the reception has been stellar so far. Give it a look! It might just make a nice gift...
We present It All Begins With Two. Our new children's book by @PTElephant that explores how new life begins and why there are only two sexes. Imaginative. Age-appropriate. Biology-focused! Order your copy at 🔗 itallbeginswithtwo.com
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Paradox Institute retweeted
In just two years, @PdxInstitute has published three bestselling biology books, two for adults and one for children. We do everything ourselves, from writing and researching to beautiful interior formatting and striking cover design. - Binary was our first bestseller, a scientific exploration of how sex is universally defined across species, reaching #1 for four weeks in Developmental Biology and Anatomy & Physiology. theparadoxinstitute.org/prin… - The Sex Development Handbook was our second, a first of its kind visual guide on how sex develops in humans -- from typical development to more than 25 disorders of sex development. The handbook reached #1 in Embryology and Developmental Biology. theparadoxinstitute.org/prin… - It All Begins With Two was our third, a beautiful, age-appropriate exploration of how new life begins and why there are only two sexes, by @PTElephant. This children's book has reached #1 in Children's Biology Books, Children's Nonfiction on Pregnancy, and Children's Anatomy & Physiology. theparadoxinstitute.org/prin… This is just the beginning. Now that we are a non-profit thanks to the help from your donations, we will be applying for large-scale funding. The next few years will be incredible. And if you are an author interested in publishing powerful, reality-based books for adults or children, we offer full-service publishing and design services. Authors who publish with us retain 100% ownership rights and 100% of sales royalties. Take a look at our services and submit your manuscript here. theparadoxinstitute.org/publ… We are working hard to restore reality to science education through bold, visual media. If you are interested in supporting our mission, please consider providing a tax-deductible donation! theparadoxinstitute.org/dona…
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We present It All Begins With Two. Our new children's book by @PTElephant that explores how new life begins and why there are only two sexes. Imaginative. Age-appropriate. Biology-focused! Order your copy at 🔗 itallbeginswithtwo.com
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We’re opening Paradox Press, a full-service publishing studio for authors interested in publishing reality-based topics! Authors who publish with Paradox Press retain 100% ownership rights and receive 100% of sales royalties. Read more about it here! theparadoxinstitute.org/publ…
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The interactive version of @PTElephant's children's book on male and female is almost done! Whether on mobile or a computer, kids will be able to select the elements on the screen and learn more about them with different learning levels. Learn more: 🔗 theparadoxinstitute.com/it-a…
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Most books which attempt to teach sexual reproduction to children fail, because they are either age-inappropriate, scientifically inaccurate, or do not foster curiosity and wonder. Our new children's book by @PTElephant will change this. It is a beautifully illustrated, age-appropriate exploration of how new life begins and why there are only two sexes. Children will discover how males produce sperm, females produce eggs, and how these tiny gametes join to start a new organism across humans, other animals, and plants. The book will also feature an audio-visual interactive version where kids can click on the text and elements in the book to hear more facts about them. No one else is producing this much-needed children's content that combines age-appropriate scientific accuracy with visual power. Sign up here for exclusive updates and a sample of the book when released! Coming end of November! theparadoxinstitute.org/it-a…
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The Sex Development Handbook is now live on Amazon! Learn the genetics and developmental biology behind how the male and female sexes are produced--both in typical development and more than 25 disorders of sex development. Order here: a.co/d/eZ3cCJ6
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Happy Halloween! 🕸️🦇🕸️ You know what's not scary? Biological facts. Mushrooms can be a little creepy, though, ngl. But not because of their biology. So let's take a quick mycology break while munching some chocolates, because you can't spell "mushroom" without m & m.
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