To not care as a negative dismissal is attested from mid-13c. Phrase couldn't care less is from 1946; could care less in the same sense (with an understood negative) is from 1966. Care also figures in many similies of indifference in the form don't care a _____, with the blank filled by fig, pin, button, cent, straw, rush, point, farthing, snap, etc., etc.
Beryllium metal is used in the aerospace and defense industries to make lightweight precision instruments. The mirrors of the Spitzer Space Telescope and the James Webb Space Telescope (JWST), which is scheduled for launch in 2018, are made of beryllium.
Beryllium is also used in nuclear reactors as a reflector or moderator of neutrons. The oxide has a very high melting point making it useful in nuclear work as well as having ceramic applications. Biological role. Beryllium and its compounds are toxic and carcinogenic.t one time it was even thought that beryllium powder would be used as a fuel for rockets on account of the colossal amount of heat which it releases when it is burnt. Now less than 500 tons of metal are refined each year because it is dangerously toxic.