The science of gerontology has evolved as longevity has improved. Researchers in this field are diverse and are trained in areas such as physiology, social science, psychology, public health, and policy. A more complete definition of gerontology includes all of the following:
Smelly bowel movements are caused by the release of gas. when bacteria, bile or acid mixes with food. Depending on the. food you eat, and where in your digestive tract the mixing. occurs, the combinations can produce various types of gas, all. with different smells.
Why perfume smells different to each of us: Receptors in the nose vary by 30% in two different people. 1  Human nose has 400 different receptors-one change could be dramatic. 2  Paper published by Monell Chemical Senses Centre in Philadelphia found one thing could smell like sandalwood to some and urine to others.