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

Illustration of a developing fetus surrounded by a clear fluid with a subtle yellow tinge, representing amniotic fluid.
January 2026

What Is the Amniotic Fluid Composed of?

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

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Human-Relevant In Vitro Models Enable Predictive Drug Discovery

Advancing Drug Discovery with Complex Human In Vitro Models

Stemcell Technologies
Redefining Immunology Through Advanced Technologies

Redefining Immunology Through Advanced Technologies

Ensuring Regulatory Compliance in AAV Manufacturing with Analytical Ultracentrifugation

Ensuring Regulatory Compliance in AAV Manufacturing with Analytical Ultracentrifugation

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Conceptual multicolored vector image of cancer research, depicting various biomedical approaches to cancer therapy

Maximizing Cancer Research Model Systems

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