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

Heading into national swimming championships, the University of Virginia relies on a mathematician, cameras and sensors to help each swimmer perform their best.

By some estimates, there are millions of people working in an informal economy in Mexico. Many are street vendors who ply their trades in the neighborhoods of the capital. They have no access to loans or financial support.

High gas prices have set off calls for conservation and investigation of price gouging. But among residents of Arizona, high gas prices have also provoked some less predictable reactions.

In Tuesday's Republican primaries, Trump-backed candidates won up and down the ballot in Nevada, while he saw a split in South Carolina, where he endorsed challengers to two GOP incumbents.

What was supposed to be a caving excursion in Missouri turned into a rescue mission after a dog was found curled up and malnourished about 500 feet into the cave system.

A new FDA rule allows adults with perceived mild to moderate hearing loss to buy hearing aids over the counter. Efforts to make them more affordable and accessible have been in the works for years.

Catch up on key developments and the latest in-depth coverage of Russia's invasion of Ukraine.

Inflation is hitting hard in rural America and could accelerate depopulation in some parts of the country, according to the latest analysis from one expert.

Under an agreement with the Justice Department, Lafarge also pleaded guilty to one count of conspiring to provide material support to designated foreign terrorist organizations.