Last time we learned about Mars' great Valles Marineris, the largest canyon in the solar system. But what about here on Earth, is the Grand Canyon really the biggest?

In a stirring tribute to a city in crisis, Lady Gaga and Bruno Mars sang "California Dreamin'" at Sunday night's Grammys ...

The 67th annual Grammy Awards struck a somber tone Sunday night as music's biggest ... city's Laurel Canyon, evokes images of an idyllic California. As they harmonized, Gaga and Mars appeared ...