A colony of golden algae as seen with differential interference contrast microscopy. Image by Wim van Egmond.
Acorn Woodpecker granary (near Sequoia National Park, California) © Michael Medina Photography
Sugarcane root cross section (20x) by Debora Leite, Univ, of Sao Paulo, Brazil
wasp 2 on the water surface - drinking [flickr: burgenschenker [ in slow motion ]]
Helmet Urchin, a.k.a. colobocentrotus atratus, Puako, Hawaii
Why does this blue stone have yellow light coming out of it? It's time to learn about the The Tyndall Effect, or Tyndall Scattering.
Palaeolithic Cave Painting Lascaux