The following images are used under permission:

Gel electrophoresis - Camille Barr

Color stained mollusk shells - Maurine Neiman

Stained Cells - Angela Stathos

Strawberries - UC Davis InnovationAccess

The following images are governmental works under the public domain:

Astronaut on Moon - NASA: http://grin.hq.nasa.gov/ABSTRACTS/GPN-2001-000013.html

X-38 Experimental Craft - NASA: http://grin.hq.nasa.gov/ABSTRACTS/GPN-2000-000192.html

Rocket Engine Blueprint - NASA

The following images are licensed under Creative Commons Attribution or Creative Commons Non-Commercial Share Alike:

Wind Energy - janie.hernandez55:http://www.flickr.com/photos/56227271@N03/5204475317/

Mobile Phone Tower - Richard Smith: http://www.flickr.com/photos/smith/462515561/

Radio Satellite Dish - Edward Webb: http://www.flickr.com/photos/crazyeddie/1463295872/

Admit One - Todd: http://www.flickr.com/photos/hryckowian/1676863227/

TGV - FaceMePLS: http://www.flickr.com/photos/faceme/2774613709/

Radio Satellite Dish 2 - Sids1: http://www.flickr.com/photos/sids1/3142874209/

Ethernet RJ-45 - Justin Marty: http://www.flickr.com/photos/jmarty/3677688990/

Carbon Nanotube - Geoff Hutchison: http://www.flickr.com/photos/ghutchis/4054690610/

Mondavi Institute - prayitno: http://www.flickr.com/photos/34128007@N04/4118322594/

High Speed Train - Dan Davison: http://www.flickr.com/photos/dannyboymalinga/4432487177/

Programming Code - Michael Himbeault: http://www.flickr.com/photos/riebart/4466482623/

F-22 Raptor - Kmilo: http://www.flickr.com/photos/_kmilo_/4470636058/

Test Tubes - [F]oxymoron: http://www.flickr.com/photos/f-oxymoron/4752989199/

Arecibo Observatory - Chris Amelung: http://www.flickr.com/photos/amelungc/4792346676/

Canon 550D Vinyl - Dee7000: http://www.flickr.com/photos/20377560@N05/4587796788/