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physiology

Illustration of pathogens, vaccines, and other necessary factors for eradicating a disease.
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How to Permanently End Diseases

December 3, 2019

Smallpox was eradicated relatively quickly, but other diseases have proved harder to eliminate. The reasons are a mix of biology and psychology.

Illustration of gut sending signals to kidneys.
physiology

How Bacteria Help Regulate Blood Pressure

November 30, 2017

Kidneys sniff out signals from gut bacteria for cues to lower blood pressure after meals. Our understanding of how the symbiotic microbes affect health is becoming much more molecular.

Illustration: sliced tooth showing tree rings
chronobiology

Teeth May Reveal a Multi-Day Biological Clock

December 13, 2016

Tiny lines laid down by tooth enamel appear to reveal a previously unknown biological rhythm. If confirmed, the finding could help researchers understand why big animals grow slower — and live longer — than small ones.