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A black and white headshot of Andrew Carstens

Andy Carstens

Articles by Andy Carstens

A male and female Chiriqui harlequin frog (<em>Atelopus chiriquiensis</em>) photographed in 2010. The species was declared extinct in 2019.

How Do Scientists Decide a Species Has Gone Extinct?

A Cape ground squirrel sits upright on its hind legs, holding its forelimbs up to its face.

Animals Are Shape-Shifting in Response to a Warming World

Artist&rsquo;s rendition of neural connections, with inactive neurons in the background

Ketamine Flips a “Switch” in Mice’s Brain Circuitry: Study

Diagram of the causes of mortality in the army in the east.

Diagrammatic War, 1858

Illustration of myelinated neuron axons in light blue, with spindly blue and purple cells interspersed among them.

A Gene Variant Linked to Alzheimer’s May Disrupt Myelin Production

fluorescently labeled microscopy cross-section of bone

Cancer Cells in Mice May Hitch a Ride with Bone-Healing Stem Cells

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

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

A mesquite tree in an arid environment

Climate Change May Favor Nitrogen-Fixing Plants

an immune cell in blood

Why Viral Infections Are More Severe in People with Down Syndrome

Kentish plover standing by nest with eggs

Avian Deception More Widespread Than Previously Thought

A black and white photo of a woman in a plumed hat in a laboratory classroom with several men

Birth of The Pill, 1956–1960

satellite view of Hurricane Ian in between Cuba and Florida&#39;s Gulf Coast

Researchers in Ian’s Path Brace for the Storm

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.

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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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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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