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The Skógafoss waterfall amidst a landscape covered in ash spewed from the Eyjafjallajökull volcano in 2010.
photo credit: © Sverrir Thorolfsson
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Jacuzzi’s — bath shaped holes in the river bed, filled with crystals — on Mount Roraima in Venezuela. Mount Roraima is the tallest of the table mountains called tepuis and is located in the southeastern corner of Canaima National Park, near the borders of Brazil and Guyana.
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Sectioned skull of a rhinoceros hornbill. The skull of this rhinoceros hornbill shows a nice separation between functional parts. The beak has to resist forces and so it is filled with struts of bone, like the rest of the highly pneumatized skull. The “horn” is just for show and has little internal reinforcement.
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Raynaud’s phenomenon is a rare disorder of the blood vessels, usually in the fingers and toes. It causes the blood vessels to narrow when you are cold or feeling stressed. When this happens, blood can’t get to the surface of the skin and the affected areas turn white and blue. When the blood flow returns, the skin turns red and throbs or tingles. In severe cases, loss of blood flow can cause sores or tissue death. Primary Raynaud’s happens on its own. The cause is not known. There is also secondary Raynaud’s, which is caused by injuries, other diseases, or certain medicines. People in colder climates are more likely to develop Raynaud’s. It is also more common in women, people with a family history, and those over age 30.
Photo credit: Kathryn Mousley
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