“SnowCrystals.com”, Kenneth G. Libbrecht1999-02-01 (data visualization, science)⁠:

Welcome to SnowCrystals.com! Your online guide to snowflakes, snow crystals, and other ice phenomena. SnowCrystals.com has been bringing you snowflake photos and facts since February 1, 1999. Over 26 million visitors so far!

[Photos / books / science; designer snowflakes, how to grow snowflakes, “identical-twin” snowflakes etc]