The US is enjoying unprecedented success in winter sports where it has long struggled, raising hopes for medals in the 2010 Olympics.
Alaskan Kikkan Randall, at Nordic Worlds, wins first medal for US in cross-country skiing since 1982.
Rare coast-to-coast white Christmas refreshes sense of unity.
Websites help runners keep track of the miles they run.
But critics say the efforts amount to a dangerous step toward legalizing drugs.