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The receptors are like locks and the keys to open these locks are the odor molecules that float past, explains Leslie Vosshall, a scientist who studies olfaction at Rockefeller University. People have about 450 different types of olfactory receptors.
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In order to understand the truth behind certain issues and reasons why symptoms act a certain way or form.
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Decreasing child mortality, improving education and providing people with economic opportunities all help to reduce fertility and population growth. International aid, fair trade and global justice are all tools to help bring global population back to sustainable levels.
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