Just finished my new header image, so I thought I’d take a moment to acknowledge the photos I used to create it.  All images were located using creativecommons.org and are licensed under a CCL.

Test tube photo:
photo by Horia Varian on Flickr
http://www.fotopedia.com/items/flickr-4273968004

Tarantula photo:
photo by mikebaird on Flickr
http://www.fotopedia.com/items/flickr-5008376479