### policy:

Government policy
* Government policies affect all our lives
  - every American citizen
  - attempt to control sharp price changes in the economy
* Government policies can affect prices that provide an incentive for more efficient freight travel
  - encourage collaboration and nurture the sharing of knowledge
  - promote economic growth in many ways
  - cause changes to terrestrial ecosystems, in both positive and negative ways
  - contribute to greater stability in the lives of young people
  - directed at industry and individuals can mitigate the effects of global warming
  - divide women against men
  - have profound effects on how our economic system performs
* changes conditions
  - economic conditions
* emphasizes individual and family responsibility for the provision of such care.
* facilitates commerce.
* focuses on reducing waste material and conserving energy.
* has a major impact on all sorts of economic activity.
* helps couples have children.
* is affected by scientific writing
  - aimed at controlling all religious movements
  - based on whether individuals are citizens or non-citizens

### policy:

Interference
* also occurs with sound waves and waves induced in a standing pool of water.
* are undesired signals and noise.
* can also occur for particles, because of the duality introduced by quantum mechanics
  - occur anywhere in the nervous system
* causes the intensity of waves to be stronger in some locations than in others.
* ensures animal behaviour
* fundamental consequence of the wave nature of light.
* has effects
  - little effects
* involves destruction.
* is blocking
  - foreign policy
  - most common in gregarious species
  - one of the most serious as well as most common problems in audio electronics
* is the ability of two waves to reinforce or partially cancel each other
  - addition, or coming together, of several waves
  - interaction of two or more waves
  - superposing of one wave on another
  - superposition of two or more waves resulting in a new wave pattern
* makes it hard to detect the much weaker radio waves emitted by objects in the universe.
* occurs in sound waves.
* occurs when light from a single source divides and recombines
  - the same stimulus is associated with more than one response
  - two rocks are tossed near each other into a lake
* special property of all wave forms.
* usually results in noise, unwanted voices or distorted television pictures.
+ Diffraction, Causes of diffraction: Physics
  * Diffraction is caused by one wave of light being shifted by a diffracting object. This shift will cause the wave to have interference with itself. Interference can be either constructive or destructive. When interference is constructive, the intensity of the wave will increase. When interference is destructive, the intensity will decrease, sometimes to a point where it is completely destroyed. These patterns of interference rely on the size of the diffracting object and the size of the wave. The strongest examples of diffraction occur in waves where the wavelength is close to the same size of the object causing the diffraction.

### policy | interference:

Clog
* are footwear
  - shoes
* is interference
* keep feet dry, without perspiration, and give full protection against moisture and mud.