A warm thank you to the authors of flickr who gave licence of their pictures to Creative Commons. Author : Pedro Ribeiro Simões License : CC BY 2.0 Direct link Author : Chris Blackhead Licence : CC BY-SA 2.0 Direct Link Changes were made Author : Deni Williams Licence : CC BY 2.0 Direct Link Author : Warren R. M. Stuart Licence : CC BY 2.0 Direct Link Author : JD Hancock Licence : CC BY 2.0 Direct link Author : Thomas Leth-Olsen Licence : CC BY 2.0 Direct link Author : Bryan Ledgard Licence : CC BY 2.0 Direct link Author : Jiuguang Wang Licence : CC BY-SA 2.0 Direct link Author : Austin Kirk Licence : CC BY 2.0 Direct link Author : Leonardo Veras Licence : CC BY 2.0 Direct link Author : lee roberts Licence : CC BY-SA 2.0 Direct Link Author : Andrés Nieto Porras Licence : CC BY-SA 2.0 Direct link