Tis the season
As if to mark to early arrival of winter, a snowflake design is formed by condensed water vapor made by the exhaust of aircraft engines in the sky over Waskom, Texas, and Shreveport, La., Oct. 30, 2011. On this same day a blizzard dumped the earliest snowfall in hundreds of years on the Northeast, cutting power to millions of people. (Courtesy photo by Jeff Walston)