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Growing crowds at America's national parks have prompted some of them to allow entry by reserved tickets only. Arches National Park in Utah may be next, and there's renewed controversy over that step.

How Sotiris Missailidis, head of R&D in Brazil's vaccine agency, used the COVID crisis to push through a game-changing effort for middle-income countries to invent their own mRNA vaccine.

In the aftermath of the explosions, Americans were glued to their screens, waiting for the chaos to unfurl into a narrative. Ten years later, we still process tragedies in similar ways.

Among the questions: What happens to the Americans still in Afghanistan? And: What does the exit mean for Biden's approach to the world?

The emergence of this new variant of concern has brought a new vocabulary into daily news reports. We asked experts to help define the terms you're being bombarded with.

Globally, boys and young men made up two-thirds of all deaths among young people in 2019. A recent report finds that many such deaths in this "neglected" age group are preventable.

You'll see testing in some airports these days — it's just like we're going back in time! And speaking of looking back, the things that protected fliers from COVID then are still a good idea.

Today, we are launching a project to look at how the ripples of climate change are radiating outward. Beginning in Senegal, we will connect the dots between climate, migration and political extremism.

Same-sex marriage was once a deeply divisive issue. Now, polls show over 70% of Americans support same-sex marriage, and Congress is set to move forward with the Respect for Marriage Act.

The 3-digit suicide and crisis lifeline – 988 – fielded nearly half a million more calls, texts and chats in its first 5 months than the old 10-digit Lifeline did during the same time in 2021.