Signals

Two American Scientists Win Nobel Prize in Chemistry

Here is a fun discussion of pigments:

True Blue Stands Out in an Earthy Crowd

Blue Through the Centuries: Sacred and Sought After

Citations and Credits

Monarch photograph

Peacock photograph

Color vision graphs and photos (Jeff Rabin, OD, PhD, Chief, Visual Function Laboratory Ophthalmology Branch USAF School of Aerospace Medicine)

IR flower photo

IR butterfly wing

Heliconius butterflies

Journal of Experimental Biology