Science, Maths & Technology
Strange coloured teeth; strange coloured bones
...become stably incorporated into bone. They've been detected in skeletons from ancient Sudan and Egypt, a possible explanation being these populations ate food contaminated with tetracycline-producing bacteria. Bones containing tetracycline glow yellow-green under ultraviolet light. Eating urchins can cause the bones and teeth of the sea otter (Enhydra lutris) to turn...