Erectile dysfunction
* Most erectile dysfunction is due to atherosclerosis.
* affects millions of men
  - older men more than younger men
* can be an inability to achieve or maintain an erection
  - have a profound effect on the quality of life of aging men
  - result from physical or psychological factors
* common complication in men with diabetes
  - problem in diabetic men
* has a profound effect on the well being of millions of men and their partners.
* is also a common problem for men with epilepsy
  - common and serious and affects millions of Indian males
  - diseases
  - disfunction
  - impotence
  - more than just a sexual problem
  - most often a symptom of an underlying medical disorder
  - often the result of physical problems
  - recognized as a clinical condition and can impact a patient's self esteem
  - strongly age related
  - suffered to some extent by thirty million American men
* is the inability to achieve or sustain an erection
  - get or maintain a satisfactory erection
  - result of a single, or more commonly a combination of multiple factors
  - term used if the nerves responsible for erection are preserved
  - what happens when there is nerve damage to the penis
* occurs in men of all ages, but with the greatest frequency in older men.
* problem that effects couples.
* refers to erection function only.
* significant health concern that affects millions of men.
* term that is replacing the word impotence in many cases.
* very common sexual complaint.
* widespread and under-reported disorder affecting millions of men.

E mail
* allows huge amounts of information to be sent and received anywhere in the world.
* is an important factor in the corporate sector
  - documents
  - messages
  - part of spam
  - used for communication

Ecological change
* bring diseases to humans.
* occur over the landscape as a result of both natural and human disturbances.

Eccentricity
* Defines the roundness or ovalness of an ellipse.
* Eccentricities are unexpected in close systems and are still to be explained.
* divides double stars into two distinct populations.
* increases the measured capacitance.
* is circularity
  - invariant with respect to scaling, rotation and translation
  - ratios
  - strangeness
* is the angle of tilt of the earth's axis
  - change in Earth's orbit around the Sun, varying between circular and elliptical
  - distance between the foci divided by the major axis
  - norm and the ability to make the most of a crisis essential to survival
* is, simply, the shape of the Earth's orbit around the Sun.
* mathematical measure of departure from circularity.
* measure of how an orbit deviates from circular.
* number that describe the degree of roundness of the ellipse.
* refers to change in the elliptical shape of the orbit.

Effusion
* are usually bilateral and small.
* can also be hemorrhagic.
* is expression
  - floods
  - palpable, and soft-tissue and bony changes are seen on radiographs
* is the collection of fluid that escapes from blood vessels or the lymphatic system
  - process of gas molecules escaping from a small hole in the container
* results when the balance between secretion and reabsorption is altered.
* special type of diffusion through a small hole or orific.
* usually occurs in a patient with advanced malignancy clinically apparent.