Physical World

A falsely colored image combines a time-lapse image of the trajectory of larger droplets and the still image showing the distribution of a diffuse gas cloud of saliva and mucus. Most of the larger droplets are pulled down by gravity well before the smaller droplets carried in the gas cloud.

To understand airborne transmission of disease, follow the flow

Viruses and bacteria travel in fluids, such as the air we breathe. Studying exhalations, toilet flushes and rain drops, with math and modeling, can sharpen the big-picture view of how to prevent infections.

Starry night sky over a closed telescope unit at the Very Large Telescope in Chile

Society

How researchers are making do in the time of Covid

The coronavirus pandemic has shuttered labs and sidelined scientists all over the world. Here’s a look at how some of them have coped.

An image of the globe oriented to show Antarctica and the Southern Ocean, with moving green lines showing the movement of wind at Earth’s surface.

Physical World

Out of Antarctica, churnings of climate change

The interplay of carbon dioxide, winds and Southern Ocean waters could be reaching an environmental tipping point

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Physical World

To understand airborne transmission of disease, follow the flow

How researchers are making do in the time of Covid

Out of Antarctica, churnings of climate change

Science literacy is more important than ever. Help us combat misinformation.