• © Daniele Penna (distributed via imaggeo.egu.eu under licence [CC BY-NC-SA 3.0])
  • © Thomas Koop
    Cirrus clouds
  • © Thomas Koop
    Microphotograph of ice crystal growing in birch pollen washing water.
  • © Thomas Koop
    Emulsion drops
  • © Thomas Koop
    Ice crystals in aqueous antifreeze glycoprotein solution