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The Show for Jan. 27, 2025: The link between a stomach virus and Alzheimer's; pollution's effect on runners and more

The brain's immune cells, or microglia (light blue/purple), are shown interacting with amyloid plaques (red) — harmful protein clumps linked to Alzheimer’s disease. This illustration highlights the microglia’s role in monitoring brain health and clearing debris.
Jason Drees/Arizona State University
The brain's immune cells, or microglia (light blue/purple), are shown interacting with amyloid plaques (red) — harmful protein clumps linked to Alzheimer’s disease. This illustration highlights the microglia’s role in monitoring brain health and clearing debris.

Scientists are trying to figure out the causes of — and treatments for — Alzheimer’s disease. Find out about the role our gut health may play. Plus, new research shows pollution slows even the fastest runners down.