The Yungas Phytogeographical province extends in the northwestern of Argentina from the frontier of Bolivia (23°) to the north of Catamarca (29°), with an area of 52.000 km 2.Not only are these ...

The Chinese were fortunate in having Gleditsia sinensis, a tree producing pods called “soap beans” which they used as a detergent. Early cleansers (clockwise from bottom left): Roman strigils ...