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Those could be useful if you're designing a fortress.
because it is so 'useful' for example we use them in cars, and also because it is so rare like gold
Germanium is interesting because it is a metalloid that shares properties of both metals and non-metals. It has semiconducting properties that make it useful in electronic devices. Germanium was used in early transistors and has applications in fiber optics, infrared optics, and solar cells.
Currently, gold is not useful in any form of energy production.
Having a low chemical reactivity gold is useful to made very resistant objects and platings.
W. T. Welford has written: 'Aberrations of optical systems' -- subject(s): Aberration, Design and construction, Geometrical optics, Optical instruments 'High collection nonimaging optics' -- subject(s): Optical instruments 'Useful optics' -- subject(s): Optical instruments, Optics 'Aberrations of the symmetrical optical system' -- subject(s): Aberration, Design and construction, Geometrical optics, Optical instruments
It exists. It has mass. It is used in optics to make laser crystals and switches for pulsed lasers. Niobium is an useful element.
Albert A. Michelson has written: 'Studies in optics' 'Studies in optics' -- subject(s): Optics 'Studies in optics' -- subject(s): Optics
One highly recommended optics textbook for studying the principles and applications of optics is "Optics" by Eugene Hecht.
Gold is valuable because it is rare, durable, pretty and extremely useful.
A large aperture telescope that does not have adaptive optics which can compensate for unevenness in the atmosphere.