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NBC correspondent Richard Engel announced that his son Henry, who had been diagnosed with Rett syndrome as an infant, died on August 9. Here's what to know about the disorder.

Most American kids quit playing sports by age 11. That means a lot of kids are missing out on some of the huge benefits of sports, including spacial awareness, physical activity and team skills.

Subtle developmental differences in children whose brains seemed normal at birth underscore the need to follow children long term — a lesson that may be key for babies exposed to COVID-19.

Almost a third of the reservation's 170,000 residents lack access to clean, reliable drinking water. The tribe wants to be able to represent itself in litigation over the Colorado River.

A decade after China's global infrastructure program started, the U.S., G7 countries and private capital will invest in clean energy, technology and other projects in developing countries.

The bivalent boosters were developed to generate an immune response from the original COVID-19 virus and BA.4 and BA.5 Omicron subvariants.

A roundup of key developments and the latest in-depth coverage of Russia's invasion of Ukraine.

For nearly a century, Rancho Santa Fe has boasted one of the most expensive and sought after ZIP codes in the country. But the discriminatory document that established the enclave remains a flashpoint.

Fashion brands are betting people will spend on virtual outfits in the immersive digital world known as the metaverse.

As of now, walking between the two sites is an unpleasant, unsafe experience.