An abstract illustration of a tooth on a bluish background, signifying teeth that are a source of multipotent dental stem cells that can have therapeutic applications in dental diseases and beyond.

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Stem cells in the teeth and gums are multipotent and easily accessible. Scientists are researching ways to harness their power for therapies beyond dentistry.

Dental Stem Cells Regenerate More Than Just Smiles

The liquid world of fetal development provides a rich source of nutrition and protection tailored to meet the needs of the growing fetus. 

Illustration of a developing fetus surrounded by a clear fluid with a subtle yellow tinge, representing amniotic fluid.

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What Is the Amniotic Fluid Composed of? 

TS Digest

Epigenetics in Evolution

Modified cover of Epigenetics in Evolution.

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Cartoon of a sea lion clapping at people.

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Ten Minute Sabbatical

Crossword Puzzle

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Opinion: The Problem with Researchers Hoarding Resources

News

A new study suggests that W. virgo hasn&rsquo;t suffered the sort of genetic deterioration that often plagues asexually reproducing species.

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When the sexually reproducing grasshopper species Warramaba whitei (left) and Warramaba flavolineata (right) mated around 250,000 years ago, they made Warramaba virgo (center), which has been cloning itself ever since.

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How a Grasshopper Gave Up Sex, Took Up Cloning

Feature

A breeding program that started with two males and two females of Ecuador&rsquo;s longnose harlequin toad (Atelopus longirostris), once thought extinct, now has dozens of adults and hundreds of juveniles and tadpoles.

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Cartoon of a scientist trying to discover an extinct species.

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Botanists celebrate their discovery of what may be the world&rsquo;s last lateleaf oak tree (Quercus tardifolia).

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Fernanda, a Fernandina giant tortoise (Chelonoidis phantasticus), was identified in 2019, decades after her species supposedly went extinct.

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Fuzz on the underside of this leaf helped botanists identify the tree as a lateleaf oak (Quercus tardifolia).

When an Extinct Species Is Found Alive, What Happens Next?

Epigenetics and the genome infographic, the shaping mutation patterns graphic

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Epigenetics and the genome infographic, the new gene functions graphic

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Epigenetics and the genome infographic, the dampening mutation patterns graphic

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Epigenetics and the genome infographic, the triggering mutations graphic

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Do Epigenetic Changes Influence Evolution? 

Illustration from the epigenetics and the genome infographic

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Infographic: How Epigenetic Marks Can Change the Genome

Infographic

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Steve Ramirez Reshapes Memories in the Brains of Mice

Profile

In the 1920s, the Institute for Sexual Research in Berlin was a haven for queer people, many of whom came to the institute seeking to express their identities without fear of being imprisoned. This undated photo depicts a costume party at the institute; its founder, Magnus Hirschfeld (second from right, in glasses), can be seen holding hands with his partner, Karl Giese (center).

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A black and white photo of roughly a dozen people in costume

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Trans Medicine, 1919

Foundations

Researchers debate the influence of extragenomic processes on evolutionary change