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Biology
explainers
Why ‘De-Extinction’ Is Impossible (But Could Work Anyway)
Several projects are aiming to bring back mammoths and other species that have vanished from the planet. Whether that’s technically possible is beside the point.
origins of life
In Test Tubes, RNA Molecules Evolve Into a Tiny Ecosystem
When researchers gave a genetic molecule the ability to replicate, it evolved over time into a complex network of “hosts” and “parasites” that both competed and cooperated to survive.
Quantized Columns
What Happens When We Give Animals Our Diseases?
While it’s understandable to focus on the diseases affecting humans, it’s important to study how our illnesses may affect animals.
evolution
Ancient Genes for Symbiosis Hint at Mitochondria’s Origins
Was the addition of mitochondria a first step in the formation of complex cells or one of the last? A new study of bacteria tries to answer this contentious question in evolutionary biology.
evolution
In Sexy Worms, Inheritance Beyond Genes Can Help Evolution
Traits from RNA molecules passed between multiple generations of worms can work with genetic changes to influence future evolution.
synthetic biology
Life With Longer Genetic Codes Seems Possible — but Less Likely
Life could use a more expansive genetic code in theory, but new work shows that improving on three-letter codons would be a challenge.
biophysics
Mitochondria Double as Tiny Lenses in the Eye
The optical properties of mitochondrial bundles in the retina may improve how efficiently the eye captures light.
developmental biology
Cells Blaze Their Own Trails to Navigate Through the Body
With self-generated gradients of chemicals and physical tension, cells in the body steer themselves to vital destinations.
neuroscience
Brain Chemical Helps Signal to Neurons When to Start a Movement
Dopamine, a neurochemical often associated with reward behavior, also seems to help organize precisely when the brain initiates movements. It’s the latest revelation about the power of neuromodulators.