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Naked ScienceScientists postulate that Earth was once sheathed in ice and complex animals evolved when the planet thawed, due to the release of carbon dioxide.

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Now PlayingNaked ScienceScientists postulate that Earth was once sheathed in ice and complex animals evolved when the planet thawed, due to the release of carbon dioxide.0SpycraftSpecial operations require skillful people, but some of the most famous missions in modern history relied on elite technology.