Friday's fatal luge crash before the opening of the Vancouver Winter Olympics highlighted the dangers of high speeds and slick surfaces in winter sports. Jeffrey Brown speaks with Olympic historian and author David Wallechinsky from Vancouver about the safety risks…

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Explosions rocked at least two buses in the southwestern Chinese city of Kunming on Monday, local media report, killing at least two people and injuring another 14 as the country attempts to tighten security ahead of next month's Beijing Olympics.

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