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Doctors Without Borders is calling it a "champagne moment." The World Health Organization says it's a "game changer."

In a small trial, an experimental vaccine protected 100 percent of participants who were at high risk for the virus. Although the results are preliminary, they offer new hope of finally stamping out the virus in West Africa — and preventing the next epidemic.

Zimbabwe is seeking the extradition of Walter Palmer, the American dentist who killed a famous lion named Cecil, which was being tracked in a university study.

At the stroke of midnight, tens of thousands of Indians and Bangladeshis living near the border between the two countries got their own country for the first time in 70 years.

As part of an agreement between the two nations, the fate of just under 15,000 people living in 51 Bangladeshi enclaves inside India and more than 37,000 in 111 Indian enclaves in Bangladesh has finally been determined. Most will stay where they are, but change their nationality. Some are moving, and some of them are leaving behind family members.

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China's capital, Beijing, became the first city in the world to be chosen to host both the summer and winter Olympic Games. It beat out a bid from Kazakhstan. NPR's Anthony Kuhn has the reaction from Beijing.

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Dissident Chinese artist Ai Weiwei, who was originally granted only a 20-day visa to visit Britain, will now receive the six-month visa he applied for. A spokesperson for the U.K. Home Office explains that the head of the department, Theresa May, was not consulted over the staff's decision to allow only a shorter stay.

"She has reviewed the case and has now instructed Home Office officials to issue a full six-month visa," the spokesperson says. "We have written to Mr. Ai apologizing for the inconvenience caused."

Updated at 2 p.m. ET

Eighteen years and nearly $400 billion since engineers begin outlining the initial concept, a small squadron of F-35B Lightning IIs has finally been declared ready to fight.

To Haben Girma's grandmother, back in East Africa, it "seemed like magic." Her granddaughter, born deaf and blind, is a graduate of Harvard Law School and works as a civil rights attorney.

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