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Via Karen Holder
Sedimentary layers with bands of hematite, magnetite (gray/black), and jasper (red) in banded iron formations of northern Michigan, USA.
A polar bear’s guard hair. Polar bears have hollow hairs that insulate their bodies and keep them warm in freezing temperatures. geneticist.tumblr...
apoptosis of a cell
White blood cells (reddish brown) attacking a cancer cell (blue and brown) geneticist.tumblr...
algae... possibly the new biofuel. thanks BIOS 312
a drop can be heavy
HIV Sculpture by Luke Jerram