Photobiological Sciences Online:
(free internet-based textbook on photobiology, sponsored by the American Society for Photobiology)
Optical Illusions & Visual Phenomena ("Illusions of the senses tell us the truth about perception" - Jan Purkinje)
Photosynthesis (how plants make chemical energy from sunlight)
Biological Rhythms
(simple classroom experiments on circadian rhythms)
The Bioluminescence Web Page
(lots of info with many photos and videos)
