29. CC BY 2.0
CC NY-NC 2.0
CC BY-NC-SA 2.0
CC BY-SA 3.0
ODbL http://opendatacommons.org/licenses/odbl/
Orin Zebest
Stéfan
Stéfan
Marcin Wichary https://www.flickr.com/photos/mwichary/2167330231/
K putt https://www.flickr.com/photos/k_putt/11792034414/
NASA http://apod.nasa.gov/apod/image/0709/freeflyer_nasa_big.jpg
Erick R.B Ortega https://commons.wikimedia.org/wiki/File:Molecula_adn.jpg
Susanne Nilsson https://www.flickr.com/photos/infomastern/15102671073/
Tooled Flatty https://www.flickr.com/photos/flattop341/1085739925/
Digital cat https://www.flickr.com/photos/14646075@N03/4581763569/
OpenStreetMap https://www.openstreetmap.org/#map=18/4.64228/-74.07989
Jaromil http://jaromil.dyne.org [public domain]