Photos: Nigel the cat's Alaska homecoming

Nigel, the 8-year-old orange tabby, was found nearly a month after he went missing in central California during a cross-country road trip. His owner, Katie Robb, picked him up from the Fairbanks International Airport on March 5.

Where in the world dogs really came from

For centuries, human fortunes have been tied to those of our proverbial best friend, and vice versa. Yet little is known with certainty about the biological origins of the species closest to our hearts.

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