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| 3 min read
Scientists have discovered that a lack of iron in pregnant mice can alter the sex development of embryos, challenging long-held beliefs about how sex is determined.

sex determination

mixing blue and pink smoke, symbolic of the muddled boundaries between sexes

Opinion: Biological Science Rejects the Sex Binary, and That’s Good for Humanity

An image of cells on a black background, with some cells stained red and some others stained green. 

Deleting a MicroRNA Cluster Reversed Biological Sex in Mice 

Switch Master: A Profile of Barbara Meyer

Rising Temperatures and the Elimination of Male Turtles

Sex Reversal Mystery Explained?

Abscisic Acid’s Role in Ferns Finally Determined

Fingerprints Yield Sex Info

Week in Review: June 29–July 3

RNA-based Sex Determination?

Trending

A team of cartoon scientists studying a giant pancreas.

Prolonged GLP-1 Exposure Remodels Gene Expression in the Pancreas by Flipping a Molecular Switch

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Cockroach Milk Proteins Churn Out an Ig Nobel Win

Photo of John Calhoun crouches within his rodent utopia-turned-dystopia

Universe 25 Experiment

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Editors Mass Resign from Elsevier Journal After Editor-in-Chief Let Go

Multimedia

Essential Genes Are Dominantly Activated by Single Transcription Factors

Essential Genes Are Dominantly Activated by Single Transcription Factors

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Rethinking ALS Biomarkers: From Discovery to Clinical Impact

Rethinking ALS Biomarkers: From Discovery to Clinical Impact

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The Scientist Digest cover September 2026
September 2026

Multiplex Microscopy Becomes Easier with Encoded Antibodies

A new system that enables researchers to uniquely tag monoclonal antibodies for use in microscopy could help simplify complex imaging studies.

View this Issue
Essential Genes Are Dominantly Activated by Single Transcription Factors

Essential Genes Are Dominantly Activated by Single Transcription Factors

EpiCypher Logo
Rethinking ALS Biomarkers: From Discovery to Clinical Impact

Rethinking ALS Biomarkers: From Discovery to Clinical Impact

Alamar Biosciences logo
Engineering CAR-Neutrophils In Vivo to Target Glioblastoma

Engineering CAR-Neutrophils In Vivo to Target Glioblastoma

Miltenyi
Best Practices for qPCR Assay Design and Optimization

Best Practices for qPCR Assay Design and Optimization

Bio-Rad

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