### device | instrument | weapon | blade:

Dull blade
* fray the edges of the grass and allow the fungus hyphae to enter.
* rip the grass, stressing the plant and creating wounds that attract insects and disease.
* tear the grass, leaving it susceptible to disease.
* wound the grass and make it more vulnerable to pests and diseases.

Grass blade
* Some grass blades grow from bottoms.
* turn yellow and then become brown and die.

Scimitar
* Most scimitar oryxes have foreheads.
* Some scimitar cats prey on mastodons
  - scimitars have water
* includes hilts
  - knife edges
  - sections

Serrated blade
* are best for cutting rope and tree limbs.
* produce the same smooth edges as do nonserrated blades.

Sharp blade
* keep lawns healthy.
* mean clean cuts and fewer openings for disease and insect infestations.
* reduce damage to roots during transplanting.

Blunt weapon
* are the weapons of choice.
* use a technique of strong blows meant to cause bruises or fractures.

### device | instrument | weapon:

Chemical weapon
* are against international law
  - also treacherous to make, keep and dispose of
  - by no means weapons of mass destruction
  - capable of causing rapid deterioration of flesh
  - easy to make and easy to hide
  - inherently genocidal
  - less implements of defense than instruments of terror
  - man-made, such as sarin or hydrogen cyanide
  - part of the Egyptian army's standard issue
  - poison gasses
  - toxic chemicals
  - weapons of mass destruction and mass annihilation
* become less lethal as they're dispersed.
* bind with oily substances and become harder to remove.
* fly, everything from deadly gas to poison powders.
* take longer to produce, but kill much faster.

### device | instrument | weapon | chemical weapon:

Lachrymator
* act on the nerve endings, the cornea, mucous membranes and the skin.
* cause eye irritation and the formation of tears.
* chemical weapon

### device | instrument | weapon | chemical weapon | lachrymator:

Acetic anhydride
* are anhydrides
  - chemical compounds
* is an anhydride
  - used to make acetate fibers and cellulose acetate, a plastic

### device | instrument | weapon | chemical weapon:

Pepper spray
* are for open well ventilated areas
  - legal in some form in all fifty states
* can stop most attackers if it's sprayed at the face.
* dangerous weapon.
* derivative of cayenne peppers and is used as a self-defense mechanism.
* is aerosols
  - all natural being made of cayenne pepper extract
* is an aerosol substance used for self-defense
  - inflammatory agent
  - legal to carry for the purposes of self-defense in most states
* is located in purses
  - roadblock
  - made from extracts of cayenne pepper
  - oil-based
  - reported to repel bears
  - tear gases
  - the most commonly carried self defense device
  - used after the use of physical force and before the use of a baton
* non-lethal means of dealing with grizzly bear encounters
* proven alternative defense to bullets.
* spray can
* type of tear gas made from pepper extracts.
* vary considerably in the amount of oleoresin they contain.
  * It makes eyes water and causes intense pain, sometimes even leading to temporary blindness. Pepper spray is an inflammatory agent. The stronger the spray is, the longer the effects last, but the average full effect lasts around thirty to forty-five minutes, with longer effects lasting for hours. Pepper spray is mostly used by police forces for riot control, but in some countries people can use it for self-defence.
* weapon that attacks the respiratory system.
* works as well on bears as it does on dogs.