What You Don’t Know About Sperm

The latest from Nautilus, and this week’s Facts So Romantic. [View in browser](| [Join Nautilus]( Did a friend forward this? [Subscribe here.]( This Thursday, read the latest stories from Nautilus—and this week’s Facts So Romantic below [EVOLUTION]( [What You Don’t Know About Sperm]( A remarkable tale of evolution. BY DAVID P. BARASH Sperm don’t get much respect. [Continue reading→]( [The Future Is Fossil-Free]( [TRIWA]( and SSAB have collaborated to bring you the world’s first watch made from fossil-free steel. With innovative materials that drive positive change and lead the industry forward, you can contribute to a more sustainable future with a watch. It’s time for decarbonization. [SHOP NOW]( The latest from Nautilus [ASTRONOMY]( [Jupiter’s Io Gets a Close-Up]( A new image of our solar system’s most volcanic body. BY KATHERINE HARMON COURAGE[Continue reading→]( [ASTRONOMY]( [A Call to Action for Earthlings]( Retired NASA astronaut Nicole Stott on her revelations from orbit. BY GAYIL NALLS[Continue reading→]( [ASTRONOMY]( [The Echoes of Light]( What astronomers see in the light bouncing across the universe. BY LIZ KRUESI [Continue reading→]( [ENVIRONMENT]( [Tame Your Climate Anxiety in 2024]( A poet invited people to share their climate fears. What she found surprised her. BY KATHARINE GAMMON[Continue reading→]( WE'RE CURIOUS TO KNOW... What is the most awe-inducing experience you’ve ever had? Let us know! Reply to this newsletter with your response, briefly explaining your choice, and we’ll reveal the top answers. (This question was inspired by [“A Call to Action for Earthlings.”]([)]( Top Answer to Our Previous Question(On the New Year’s Resolution You’re Most Excited About) - I spent the last two hours of 2023 reading my journal. I was flabbergasted at how this habit can summarize all of the year in a few pages. I just wish I was dedicated to journaling every day. I am resolute to write every night in 2024 to have a better “last two hours.” – Ali FACTS SO ROMANTIC The 5 Best Things We Learned Today Both chimps and bonobos have enormous testicles, while those of gorillas (and humans) are comparatively tiny. [Nautilus→]( Io, Jupiter’s closest moon, has mountains soaring beyond 57,000 feet tall (dwarfing our 29,000-foot Everest). [Nautilus→]( Astronomers can watch the echoing light from a supernova blast and paint a picture of how it exploded. [Nautilus→]( Giving mice the gut microbes of people afflicted with social anxiety disorder makes them afraid of other mice for longer than they otherwise would be. [The Guardian→]( A tiny fraction of all species—from trees to rodents to fish—makes up most of nature’s biomass. [PNAS→]( [“In certain bee species, the male’s body literally explodes after copulation.”]( [David Barash writes about the surprising but intuitive logic of sperm cooperation.]( Better Living Through Science Soothe your headaches and alleviate eye strain with [Therabody’s biometric SmartGoggles](. This comfortable eye mask delivers a combination of personalized therapies to help you shake off your day and relax. What does it mean to be healthy? By analyzing your blood, DNA, and daily habits, [InsideTracker]( creates personalized, evidence-based health recommendations––just for you. Wouldn’t it be nice if you could predict when you’re getting sick? [Oura Ring]( can help. This sleek wearable continuously measures your body temperature, heart rate, and more to give you a heads up when you might be coming down with something. Your free story this Thursday! [HISTORY]( [The Dr. Strange of the American Revolution]( Benjamin Rush, a signer of the Declaration, became one of the most preeminent physician-scientists alive, founding American psychiatry. BY BRIAN GALLAGHER “I ascribe the Success of our Revolution to a Galaxy,” Benjamin Rush wrote to John Adams, in 1812. [Continue reading for free→]( EXCLUSIVE MEMBER CONTENT | [Explore Memberships→]( [Where Art Meets Science]( Our readers often tell us that our commitment to art and illustration is one of the most cherished parts of Nautilus. It’s a key ingredient in the special sauce that makes Nautilus and our community so unique—the recognition that art is another outlet for the creativity that drives our storytelling. With that in mind, we’ve got a gift you’re going to like: our favorite art platform, Colossal, is offering $25 towards a membership to their platform, exclusive to Nautilus members. Colossal is a leading contemporary art platform that celebrates the work of thousands of artists, many of whom are influenced by science. It’s an online gallery, where you’ll find rich stories behind the work and artists. Recently, they’ve featured [puzzles designed to mirror the rare element bismuth’s crystalline network](, [historic glass models of marine invertebrates](, and [an ambitious project to photograph every edible plant seed in exquisite detail](. This $25 credit is only available to Nautilus members, so join Nautilus with any membership to claim yours. [JOIN NOW]( P.S. The 18th-century physician-scientist and revolutionary Benjamin Rush, who signed the Declaration of Independence and went on to found American psychiatry, was born on this day in 1746. Renditions of our national heritage can often read like a “comic-book version of history,” the historian Jill Lepore has written. “Paine is Aquaman to Washington’s Superman and Jefferson’s Batman.” I wondered who Rush would be, so I asked his recent biographer. His answer: [“Dr. Strange.”]( Today’s newsletter was written by Brian Gallagher Thanks for reading. [Tell us](mailto:brian.gallagher@nautil.us?subject=&body=) your thoughts on today’s note. Plus, [browse our archive]( of past print issues, and inspire a friend to sign up for [the Nautilus newsletter](. [Facebook]( [Twitter]( [Instagram]( Copyright © 2023 NautilusNext, All rights reserved. You were subscribed to the newsletter from [nautil.us](. Our mailing address is: NautilusNext 360 W 36th Street, 7S, New York, NY 10018 Don't want to hear from us anymore? [Unsubscribe](