Electromagnetism
* can either attract or repel, but gravity can only attract.
* describes the relationship between electricity and magnetism.
* encompasses various real-world electromagnetic phenomena.
* holds electrons in orbit around the atomi nucleus.
* includes the study of electricity, magnetism, and how they are connected.
* involves an antisymmetric tensor.
* is an idea that combines electricity with magnetism
  - called a gauge theory because the gauge symmetry actually defines the theory
  - essentially the foundation for all of electrical engineering
* is one of the four fundamental interactions , as is strong force
  - most beautiful theoretical constructs in all of physics
  - probably one of the worlds wonders
  - reduced to a problem which can be described in terms of pure Newtonian physics
  - responsible for the vast majority of our everyday experiences
  - ubiquitous
* provides light, to see the letters with.
+ Photon, Electromagnetism: Basic physics ideas :: Electromagnetism :: Light :: Elementary particles
  * In particle physics, photons are responsible for electromagnetic force. Electromagnetism is an idea that combines electricity with magnetism. One common way that we experience electromagnetism in our daily lives is light, which is caused by electromagnetism. Electromagnetism is also responsible for charge, which is the reason that you can not push your hand through a table. Since photons are the force-carrying particle of electromagnetism, they are also gauge bosons. This would mean that dark matter does not have a charge, and does not give off light.
+ Supersymmetry, Dark matter Theory, Lack of Interaction With Electromagnetism: Cosmology :: Quantum mechanics :: String theory
  * If scientists could somehow make a link between supersymmetry and dark matter, this would raise many new questions. Electromagnetism is one of the four fundamental interactions, as is strong force.

Environmental risk
* Many environmental risks are associated with our use of fossil and nuclear fuels.
* are a fact of life in site development.
* involve the laws and regulations of the company.

Enrichment
* Ask children to list their favorite sandwich foods.
* also gives animals choices and some control over their environment.
* can and does consist of making another's life easier, or simpler, or more fulfilling
  - focus on several aspects of the environment
* class that only few students go into.
* commonly increases secondary production.
* decrease toward lower temperatures and higher pressures.
* encourages natural behaviors in creative habitats.
* essentially purification process.
* is addition of vitamin A to a food which the vitamin is present in small amounts.
* is an important part of animal care
  - oenological process to increase the natural alcohol content in wine
  - gifts
  - giving students the opportunity to learn in greater depth and breadth
  - important to any animal kept in captivity
  - improvement
* is the addition of nutrients to foods
  - essence of the learning experience
  - modification of the density, depth, diversity, and complexity of the curriculum
  - used for high precision
  - very important in the care of animals
  - vital to the well-being of children
* keeps zoo animals active and interested in their environment.
* means adding dimension to what is being studied
  - the positive sum of experiences that have a cumulative effect upon the individual

Exercising
*  shortness of breath.
* are athletic activities.
* are used for fun
  - good health
* are used for healthy bones
  - livings
  - longevities
  - reducing weight
  - training
* cause breathing
  - exhaustion
  - fatigue
  - fitnesses
  - heart attacks
  - muscle growth
  - pain
  - physical fitnesses
  - relaxation
  - sweat
  - weight loss

Ethnographic research
* has broad implications for many fields, including education.
* uses folklore and geographic methods.