Pamukkale, 19 km (12 miles) north of Denizli, is Turkey’s foremost mineral-bath spa because of its natural beauty: hot calcium-laden waters spring from the earth and cascade over a cliff. As they cool they form dramatic travertines of hard, brilliantly white calcium that form pools.
Pamukkale has been used as a spa since the second century BC.
Inside a Changing Autumn Leaf
One of the great wonders of life is watching the leaves change colors in the fall. When temperatures get cool, chlorophyll begins to break down revealing the underlying pigments in the plants’ sap. This depiction of the inner-workings of a maple leaf shows the process in action.
Sorce: SciAm Blog Network