Getränke schlauer kühlen | Die Wissenschaft der schnellen Erfrischung
Von July 7th, 1909 by Ulysses Sherman Grant, USGS photo library, public domain 2August 11, 2004 by Bruce F. Molnia, USGS, public domain 3 - http://globalwarmingart.com/wiki/Image:McCarty_Glacier_jpg, Gemeinfrei, https://commons.wikimedia.org/w/index.php?curid=17196784
Earthrise, the iconic image from Apollo 8 taken by astronaut William Anders in 1968. By NASA/Bill Anders - http://www.hq.nasa.gov/office/pao/History/alsj/a410/AS8-14-2383HR.jpg, Public Domain, https://commons.wikimedia.org/w/index.php?curid=306267