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Uber has never been profitable, yet the ride-hailing company may be valued at as much as $90 billion when it goes public Friday. It will be one of the largest tech IPOs ever.

The Social Security Administration says it's trying to clean up its records. But immigration advocates fear the real objective is to expose undocumented immigrants at work.

Space scientists on Earth have improvised a tool on the Mars rover to help them figure out how a giant mountain on the Red Planet came to be. Their surprising conclusion: It's likely windswept sand.

Carhenge in Alliance, Neb., will be prime viewing for this month's total solar eclipse. The town is preparing for thousands of visitors.

Very few humans have gone up against bird flu. But we've all dealt with seasonal flu for years. Some of our immune systems might be primed to fend off a worse case, research finds.

Some senior living communities are caring for people with dementia alongside other residents, not segregated behind locked doors.

A group of Congressional lawmakers wants to funnel millions of dollars toward organizations that pair service dogs with veterans with PTSD. The aim is to curb alarming rates of suicide among veterans.

The White House will be imposing targeted sanctions on Venezuelan President Nicolas Maduro, in response to his efforts to rewrite his country's constitution. This is only the fourth time the U.S. has sanctioned a head of state.

Forty percent of babies in the U.S. are born to unmarried mothers. Increasingly, those moms are over 30, at a time when teen pregnancy has fallen off a cliff and births are declining for younger women.

Data from nearly 43,000 men around the world found that sperm counts dropped by more than half in Western countries. It could reflect a decline in health overall, scientists say.