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After almost five months of conflict, the Ukrainian government and pro-Russian separatists have signed a truce to end the fighting. More than 2,600 people have died in the violence between the two sides, and hundreds of thousands have been forced from their homes.

President Obama and other NATO leaders are returning from Wales, after two days there spent discussing the future of the organization. The summit touched on topics that ranged from Ukraine to the Islamic State in Iraq and Syria.

Population growth, the cutting down of forests and increased mobility all contribute to the current crisis. "The virus hasn't changed," says one infectious disease expert. "Africa has changed."

The lockdown's effectiveness will depend on citizens buying in to the government's plan. The news comes as the World Health Organization says it's speeding up delivery of possible vaccines.

Testing, tenure, pay, standards, business influence, poverty and inequality — the big education issues have been with us a long time, according to a new book.

Former Gov. Bob McDonnell's conviction is a reminder that politicians are more likely to be nailed for petty chiseling than for fleecing the public treasury for billions in pork barrel projects.

Denim sales fell 6 percent over the past year. Blue jeans haven't hit the skids this hard since Marlon Brando and James Dean made them famous in the 1950s.

Preparing for its initial public offering, e-commerce company Alibaba estimates its stock will sell for $60 to $66 a share. The retailing giant will be listed on the New York Stock Exchange.

We live on a planet, next to a star that's part of a galaxy that's part of ... ah, here comes the new discovery. We are at the very tip of a giant galactic "supercluster." Take a look.

At 4:30 a.m., medical student Ryan Klitgaard would wake up to a Nicaraguan newspaper vendor yelling through a megaphone. Then came a day of treating patients — and fending off dogs and chickens.