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Honoring the five officers who were killed last week, the president spoke about strains on police and race relations. Former President George W. Bush also called for unity.

The late senator, war hero, husband and father was memorialized in Washington, D.C., on Saturday by family, friends and former Presidents Barack Obama and George W. Bush.

All over the continent, birds gather by the millions to breed.

A story about two Texas boys, a secession, and egg rolls.

A system is in disarray and mistakes are literally being buried.

Is darkness becoming extinct?

Edinburgh is the historical and cultural heart of Scotland.

Michael Wood tells the tale of China's Renaissance.

As cities grow, animals are displaced. Witness their stories of conflict and resolution.

Explore the Yukon, North America's legendary frozen River.