Should egg and sperm donors reveal their identities? The debate pivots on genetics and medical history.

Should egg and sperm donors reveal their identities? The debate pivots on genetics and medical history.

Cassandra Adams performs on stage at the Jersey City Theater Center in March 2019 to raise awareness about traumatic experiences that she and others have had with anonymous donor conception.

Cassandra Adams

Until age 35, Cassandra Adams assumed her mother and father were her biological parents. Then she took saliva tests through two genealogy databases—23andMe and AncestryDNA—and discovered a discrepancy in her heritage. In bringing up the matter with her parents, she learned that fertility issues had led the couple to use a sperm donor.

“Most people my age were not told,” said Adams, now 40 and a stay-at-home mom in Jersey City, New Jersey, who is involved with donor-conception advocacy. “Even now, there’s still a lot of secrecy in the industry. There are still many parents who aren’t truthful or planning not to be truthful with their children.”

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Susan Kreimer
Susan Kreimer is a New York-based freelance journalist who has followed the landscape of health care since the late 1990s, initially as a staff reporter for major daily newspapers. She writes about breakthrough studies, personal health, and the business of clinical practice. Raised in the Chicago area, she holds a B.A. in Journalism/Mass Communication and French, with minors in German and Russian, from the University of Iowa and an M.S. from the Columbia University Graduate School of Journalism.
Fast for Longevity, with Less Hunger, with Dr. Valter Longo

Valter Longo, a biogerontologist at USC, and centenarian Rocco Longo (no relation) appear together in Italy in 2021. The elder Longo is from a part of Italy where people have fasted regularly and are enjoying long lifespans.

Valter Longo

You’ve probably heard about intermittent fasting, where you don’t eat for about 16 hours each day and limit the window where you’re taking in food to the remaining eight hours.

But there’s another type of fasting, called a fasting-mimicking diet, with studies pointing to important benefits. For today’s podcast episode, I chatted with Dr. Valter Longo, a biogerontologist at the University of Southern California, about all kinds of fasting, and particularly the fasting-mimicking diet, which minimizes hunger as much as possible. Going without food for a period of time is an example of good stress: challenges that work at the cellular level to boost health and longevity.

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Matt Fuchs
Matt Fuchs is the host of the Making Sense of Science podcast and served previously as the editor-in-chief of Leaps.org. He writes as a contributor to the Washington Post, and his articles have also appeared in the New York Times, WIRED, Nautilus Magazine, Fortune Magazine and TIME Magazine. Follow him @fuchswriter.
Silkworms with spider DNA spin silk stronger than Kevlar

Silkworm silk is fragile, which limits its uses, but a few extra genes can help.

Adobe Stock

Story by Freethink

The study and copying of nature’s models, systems, or elements to address complex human challenges is known as “biomimetics.” Five hundred years ago, an elderly Italian polymath spent months looking at the soaring flight of birds. The result was Leonardo da Vinci’s biomimetic Codex on the Flight of Birds, one of the foundational texts in the science of aerodynamics. It’s the science that elevated the Wright Brothers and has yet to peak.

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Jonny Thomson
Jonny Thomson taught philosophy in Oxford for more than a decade before turning to writing full-time. He’s a staff writer at Big Think, where he writes about philosophy, theology, psychology, and occasionally other subjects when he dares step out of his lane. His first book, Mini Philosophy, is an award-winning, international bestseller, and has been translated into 20 languages. His second book, Mini Big Ideas, was published in 2023.