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Ukrainian President Petro Poroshenko said he was hopeful that this would be a long-lasting peace. The central disagreements in conflict, however, remain.

Ukraine and the Russia-backed rebels have announced a cease-fire agreement set to go into effect Friday.

From compulsive bears to self-destructive rats, science historian Laurel Braitman studies animals with mental health issues and asks what we can learn from them.

The United States launched airstrikes in Somalia on Monday targeting Ahmed Abdi Godane, a co-founder of the al-Qaida affiliate in Somalia.

The diplomat violated a quarantine. The doctor became ill but still saw patients. Now Africa's most populous country is scrambling to find more than 200 people who could have Ebola.

From swaying elephants to a shirtless organist, there have been several "gotta see them to believe them" classical clips posted online lately.

Neil Oxman, who has managed political ad campaigns, talks about what works and what doesn't; Ken Tucker reviews The New Pornographers' new album; Dana Goldstein talks about her book The Teachers Wars.

Kei Nishikori put a buzz into the U.S. Open crowd in New York and put himself into the history books, becoming the first Asian man to reach a Grand Slam tennis final.

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.