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Will that be cash, check or bitcoin?

Bitcoins have soared in value in recent weeks, touching $1000 per bitcoin earlier this week. They've become so popular some traditional businesses are accepting them for payment — but not everyone has embraced them.

Arts, Culture & Media

Geo answer: fifty miles

Fifty miles. That's about the distance separating the United States and Russia. And it's the answer to today's Geo Quiz. The World's David Leveille takes a look at an old proposal to link Siberia and mainland Alaska by tunnel.