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Being a good mother depends on many factors, including the the bacteria in the mouse mother’s gut. IvonneW/iStock/Getty Images Plus

In mice, a mother’s love comes from the gut

Microbes can alter the minds of mouse mothers and disrupt their natural instinct to nurture their young.
Air pollution exposure during mid to early life may be more important to developing Alzheimer’s disease than doctors realized. Cecilie Arcurs via Getty Images

Air pollution may contribute to Alzheimer’s and dementia risk – here’s what we’re learning from brain scans

The tiny air pollutants known as PM2.5, emitted by vehicles, factories and power plants, aren’t just a hazard for lungs. A study finds more brain shrinkage in older women exposed to pollution.
Sampling wildfire smoke sometimes means sticking a tube out the window of an airplane. Brett Palm/University of Washington

Wildfire smoke changes dramatically as it ages, and that matters for downwind air quality – here’s what we learned flying through smoke plumes

Thousands of chemical compounds in wildfire smoke are interacting with each other and sunlight as the smoke travels. For people downwind, it can become more toxic over time.
The older you get, the more slowly you heal, and there are a number of reasons why. Westend61 via Getty Images

Why do older people heal more slowly?

Healing is a complicated process. As people age, higher rates of disease and the fact that old cells lose the ability to divide slow this process down.
Safety precautions like wearing face masks and leaving space between desks are also important to limit the coronavirus’s spread. Ben Hasty/MediaNews Group/Reading Eagle via Getty Images

Reopening elementary schools carries less COVID-19 risk than high schools – but that doesn’t guarantee safety

New research points to why reopening elementary schools is the safest bet and what else needs to happen for schools to have the best chance of staying open.

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