Hairy cell leukemia (HCL) 1  Is a type of blood cancer that begins in the bone marrow. 2  Is a rare type of leukemia in adults.  Hairy cell leukemia gets its name from the short, thin projections that look like hair on its cells.
In 1799 Humphrey Davy discovered anesthetic properties of nitrous oxide (N20)---also known as laughing gas.. He had recently joined Thomas Beddoesâ Pneumatic Institution (established 1798) for treatment of disease by inhalation.
Serious early work with anesthesia began with nitrous oxide and ether. An English chemist, discovered that nitrous oxide relieved his headache and dental pain, but his report went unnoticed. Then an American dentist extracted his own teeth under nitrous oxide.