Explained

Photograph of heart muscle cells seen under the microscope.

Now in development: off-the-shelf stem cells

Their potential as universal donors promises to make regenerative medicine more broadly practical

Conceptual illustration featuring a syringe and virus particles.

Getting a Covid-19 vaccine — quickly and safely

Researchers around the globe are working with unprecedented speed to find the vaccines we need to find our way through the pandemic. What’s the bar for safety and effectiveness?

Image shows an irregularly shaped blue blob with many slender projections. Attached to it is a smaller, rounder blob colored orange.

Health & Disease

Arming immune foot soldiers against cancer

Natural killer cells are born ready to attack the disease. Biologists are developing ways to make these cells tougher and more targeted.

Underwater photograph of a green sea turtle.

Food & Environment

The case for ocean optimism

With the health of the ocean under threat, a rallying cry for marine conservation goes global. Here are some of the good-news stories.

Photograph of a researcher crouched down on a lawn covered with white clover plants. The researcher is wearing jeans and a black tank top and is sampling the plants. There are trees in the background. A person wearing a baseball hat and teal shirt walks by in the background.

Living World

Urban evolution: How species adapt to survive in cities

Plants and animals are evolving in cities around the world — offering ways to study longstanding scientific questions and clues to where climate change is taking us

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