### device | disc:

Spinal disc
* are made of soft tissue and are placed between each of the bony vertebrae.
* break down with age, becoming dry, brittle, and less resilient.
* have no direct blood supply.

Doorstep
* Some doorsteps are part of architecture
  - temples
* includes sections.

### device:

Drum
* Many drums have their roots in the military and warrior tribes.
* Most drums have specific functions
  - produce sound
* Some drums have a carved handle
  - crown to the lid as part of their design
  - diameter that is bigger than the ordinary drum
* are a percussion instrument and can play a very big part in bringing people to worship
  - an essential instrument in jazz music
* are an important instrument in many cultures
  - part of life and ceremony in many cultures
  - cans
  - containers
  - instruments
  - light weight
  - likely the oldest instrument known to mankind
* are located in ears
  - music stores
  - orchestras
  - parades
  - rock bands
  - made of wood
  - membranes
  - one of the most physically demanding of all musical instruments
  - percussion instruments
  - percussions
  - photosensitive and can be damaged with prolonged exposure to light
  - small portable instruments used to accompany native vocal and dance performances
* are the center of a ceremony, and the beat to which the dancers turn and move
  - main instrument used to give the music a variety of rhythm and beats
* are the primary form of communication used in Africa
  - source of music used during worship, and well as for other social events
* are used for bangings
  - hitting
  - rhythms
  - vessels
* bring a certain magic to all forms of gatherings and celebrations.
* come in all shapes, sizes and materials of construction
  - apple and pear shapes
* have functions
* range in size and are known by different names according to their size.

### device | drum:

Black drum
* are gray or black colored with a high arched back.
* can and do spawn more than once a year.
* occur throughout the Gulf of Mexico, up the Atlantic to Maine and even down to Brazil.
* show their much darker tails when feeding.

Bongo
* are active primarily at night.
* includes sections.
* is an antelope
* live in both captivity and the wild.
+ Bongo (antelope): Bovines
  * The western bongo is near threatened and the mountain bongo is critically endangered. Bongos eat plants. They live in forests in Africa. Kenya is the only place eastern bongos live in the wild. Like the west African giraffe, the eastern or mountain bongo is one of the most threatened animals in Africa. Bongos live in both captivity and the wild.

Electronic drum
* are also compact
  - electronic drums and they feel great just how they are
  - great for much of today's modern music
  - used for many purposes
* can feel cold, especially with headphone use.
* use velocity sensors to control the size of the graphics on a display.

Frame drum
* Most frame drums are round, but they can be square or triangle-shaped.
* are among the oldest and most versatile of drums.
* have a long history of use by women
  - ring, which lends itself to singing with it

Larger drum
* eat small crabs, worms, algae, small fish and mollusks.
* produce lower-pitched sounds than small drums.

Earphone
* are illegal and unsafe
  - products
  - transducers
* deliver a series of clicks or tones to each ear separately.
* help engage students who struggle to read
  - to limit interruptions for other hikers

### device | earphone:

Earplug
* are also protective against routine loud noise, such as the vacuum cleaner
  - earphones
  - plugs
  - small inserts that fit into the outer ear canal
* come in a variety of styles and sizes.
* effectively dampen wind noise, yet allow shrill sirens to be heard clearly.
* help to reduce high and midrange frequencies.
* is an earphone

### device | earphone | headset:

Binaural headset
* are stereo, and allow the wearer to hear out of both ears.
* have earpieces that cover both ears.