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A surge in Amazon stock made Bezos worth more than $90 billion on Thursday, putting the company's founder and CEO ahead of Microsoft founder Bill Gates. Gates, however, has given billions to charity.

Measuring the quality of those little swimmers usually requires a trip to the doctor. Researchers have come up with a smartphone accessory that would let men do that at home in less than five seconds.

Rodents, primates and bats likely carry hundreds of thousands of viruses we haven't yet identified. But how do you know which ones might infect humans?

The train was traveling at twice the speed limit as it entered Hoboken Terminal, according to a preliminary examination of video and data records recovered from the wreckage.

The California-based health care provider plans to enroll its first students in 2019. It's the latest of 20 U.S. medical schools opened in the past decade to boost the number of primary care doctors.

The California-based health care provider plans to enroll its first students in 2019. It's the latest of 20 U.S. medical schools opened in the past decade to boost the number of primary care doctors.

The administration has cleared out the State Department's top echelons. Congress is noticing the vacuum. So are other countries: Mexico's visiting foreign secretary went straight to the White House.

The Supreme Court is already short one justice because Republicans refuse to consider President Obama's nominee. Two sitting judges are in their 80s, so additional vacancies are likely.

Fans of "Hamilton: An American Musical" gather for San Diego's first-ever Hamiltunes singalong event.

It's March Mammal Madness, a bracket with real animals facing off in fictional battles. Hundreds of science classes are playing in schools around the country.