(25) NIH.Escherichia colibacteria. Public Domain.
(26) The_Anatomy_Lesson.jpg. Public Domain.
(27) http://commons.wikimedia.org/wiki/File:Fume_hood.jpg. Public Domain.
(28) http://upload.wikimedia.org/wikipedia/commons/5/5f/Lab_bench.jpg. CC-BY
1.0.
(29) Derek Ramsey. A Monarch Butterfly. GNU-FDL.