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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.

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?

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.

Now in development: off-the-shelf stem cells

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

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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