Second generation snowflakes born in U.S.

Sources: ABC News, ABC News (U.S.), Associated Press, New York Times, Wall Street Journal, New Hampshire Public Radio, AP, USA Today, New Zealand Herald, National Snowflake Center, New Yorker, New England Snowflake Association, US Department of Agriculture, National Geographic, American Snowflake Club, New Horizons Foundation, United States Department of Education, National Institute of Standards and Technology, National Weather Service, National Oceanic and Atmospheric Administration, National Academy of Sciences, National Park Service, NOAA, USDA, National Institutes of Health, United Kingdom, United Nations, and Reuters.