### extremely hazardous substance:

Curium
* are chemical elements
  - radioactive substances.
  * It radioactive metal. It has the chemical symbol 'Cm'. It has the atomic number 96. In chemistry it is placed in a group of metal elements named the actinides. Curium transuranic element. It radioactive element that does not exist in nature. Curium has to be made. Curium has a silver color. Curium was named after Marie Curie and her husband Pierre
* hard, brittle, radioactive silvery metal
  - silvery metal that tarnishes slowly in dry air at room temperature
  - dense radioactive silvery-white metal
* has peculiar magnetic properties.
* is an extremely hazardous substance
  - found in spent nuclear fuel and small amounts are produced for research
* is highly radioactive and it glows red in the dark
  - made synthetically
  - one of the most radioactive isolable elements
  - probably present in uranium ores
  - produced artificially, in small quantities for research purposes
  - radioactive and only available in small amounts
  - silver in color, is chemically reactive, and is more electropositive than aluminum
  - typically quite insoluble and adheres very tightly to soil particles
  - used as a power source in spacecraft
* man-made heavy element that belongs to the actinide series of chemical elements.
* radioactive element that has a silvery color
  - element, a strongly alpha emitter - dangerous, of course
  - rare earth metal
* silver metal and usually makes faint yellow compounds.

### extremely important:

Atmospheric gas
* Some atmospheric gases absorb radiation.
* Some atmospheric gases contribute to effects
  - greenhouse effects
* are extremely important
  - in an equilibrium state of dynamic and permanent exchange with living matter
* fill spaces between the snow crystals.

Human nutrition
* focuses on the nutrient needs of humans to promote health.
* is extremely important.
* sustains human metabolism.

### extremely painful condition:

Stenosis
* can also develop from injuries, infections, or tumors
  - occur as a result of rheumatic fever
  - occur in all areas of the spine, but it is most common in the lumbar spine
* constriction or narrowing of the valve opening.
* generally is due to excessive scar reaction following surgery.
* is an extremely painful condition
  - illnesses
  - one reason why valves are repaired or replaced
  - pathology
* is the anatomic narrowing of the lumen of the ureter
  - diseased arterial tissue
* means a narrowing of a passage
* progressive disease.
* sounds often are indicators of inflammatory constriction of respiratory pathways.

### extremely painful condition | stenosis:

Aortic stenosis
* causes increased pressure in the left ventricle.
* common congenital disease.
* congenital heart defect, meaning it's something the dog is born with.
* is caused by many disorders
  - diseases
  - more common among men
  - often progressive, growing worse with time
  - one of the most common and most serious valve disease problems
  - stenosis
  - stricture
  - the most common valve disease in the elderly
* narrowing of the aortic valve opening
  - opening of the aortic valve
  - valve through which blood leaves the heart
* occurs due to improper formation of the valve.
* poses a high risk of endocarditis.

Mitral stenosis
* can also cause interstitial edema with a normal-sized cardiac silhouette.
* causes damming up of blood in the left atrium, and ultimately in the lungs.
* is acquired and usually caused by rheumatic fever
  - almost always due to scarring of the valve from rheumatic fever
  - caused by childhood rheumatic fever, which damages the heart valve
  - stricture
  - usually controllable with treatment, and improved with surgery

Pulmonary stenosis
* can vary from mild to severe.
* is classified as mild, moderate, severe and critical
  - the second most common congenital heart disease
  - then a narrowing of the pulmonary valve