The next flu pandemic may be hibernating in an Arctic glacier or frozen Siberian lake, waiting for rising temperatures to set it free.Then birds can deliver it back to civilization.

• 未来的流感大流行可能蛰伏在北极冰川或冻结的西伯利亚湖泊之中，等到气温升高就会复活，然后由鸟类重新传播到文明世界。