The term "Unobtanium" originates from aerospace engineers in the late 1950s, where it was used as a Hand Wave for a material sufficiently strong, light, and/or durable to meet the needs of a particular situation under discussion, even if no known material could possibly do so.
It has occasionally been used in official discussions to avoid directly identifying a material whose use is still considered top secret (such as the titanium skin in the project that eventually produced the SR-71 Blackbird).
Following this would be medical and/or chemical wish-fulfillers; Classical real-world alchemy casually referred to carmot, the base substance of the Philosopher's Stone, and Azoth, either the "universal medicine" or "universal solvent".
The ancient Greek writer Plato referred to "orichalcum" (Greek for "mountain bronze") in his description of Atlantis.
In Science Fiction, it will usually take one of three flavors: whatever stuff makes Faster-Than-Light Travel possible, closely followed by the stuff that can mess with gravity (if they're not one and the same), and finally, the stuff they make Humongous Mecha and Alien spacecraft out of, which is why they tend to be effectively immune from earthly weapons or environmental damage.
For Willing Suspension of Disbelief, authors may pick out something actively being researched within the scientific community at the time of writing and run with it.
Naturally, this risks dating the work when Science Marches On and today's "super technology" buzzword becomes the next generation's comic-book junk science.
The cornerstone of the ancient building, which lies on a construction site for exclusive apartments, long precedes the time of Abraham and the rest of the Bible’s figures.Few serious scientists and non-believing scholars today view the Bible as an infallible history textbook, but that fact will not stop the faithful from trying to fit each piece of pottery, every building block found in Israel, into the biblical picture.In this way, we have been subjected to a raucous parade of “artifacts” in recent years, such as the so-called James Ossuary with a forged inscription; the “Jesus Family Tomb,” which was useless for biblical purposes; the fake ivory pomegranate supposedly from Solomon’s temple, and the bogus “Yoash/ Jehoash inscription,” which purportedly proved the temple’s existence once and for all.Thunderbolt Iron is especially popular in fiction (and has some basis in reality until furnaces were invented, it was the best source of refined iron).Much mad science uses unobtainium, such as chemicals with impossible properties, universal solvents that can dissolve anything in the blink of an eye, super-explosives that make nitroglycerin look like a weak cough, and plenty of other funny-colored solutions.