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Scientists have begun to find abnormalities in the immune systems of some long-COVID patients that might help explain the syndrome, at least in some people. But there is still much more to learn.

The James Webb Space Telescope will give a glimpse of the earliest galaxies formed after the Big Bang — but only if the telescope is kept frigid. That's why there's a tennis court-sized sunshield.

After Republicans won big in Florida, Democrats and the groups that organize for them are reckoning with what went so red in the country's largest swing state.

Twenty candidates will take the stage over two nights in Miami this week. With front-runner Joe Biden under pressure, can another candidate, like Elizabeth Warren, make the most of the opportunity?

Amid heightened uncertainty about the global economy, all three U.S. indexes are in a bear market as the third quarter comes to a close.

If Donald Trump wins most of Indiana's delegates, his path to the nomination will be clear. Even if Bernie Sanders wins the state, he will likely wake up with less of a chance of being the nominee.

They're speaking out and leading protests to learn the fate of fathers and brothers who are among the many hundreds of disappeared Pakistanis — most of them men. Are they making a difference?

Statements recognizing Indigenous rights to territories seized by colonial powers may be well-meaning. But some Indigenous leaders fear these acknowledgments may become routine and performative.

COVID-19 disrupted health care across the globe. causing the biggest drop in childhood vaccination rates in decades. UNICEF's latest estimates find that nearly 50 million children entirely missed out.

The brunt of the storm largely missed New Orleans this time around. As Hurricane Gustav was losing steam, people who stayed behind as others evacuated surveyed the damage.