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→Modern technology in ancient times
# An Inca pendant, dated from 500 to 800 AD, that turns out to be a model of a high-speed aircraft, possibly a jet. More remarkably, the object's apparent rudder fin bears an engraved [[Hebrew]] or [[Aramaic]] letter beth.<ref name=top10/><ref name=s8int/>
# An Inca pendant, dated from 500 to 800 AD, that turns out to be a model of a high-speed aircraft, possibly a jet. More remarkably, the object's apparent rudder fin bears an engraved [[Hebrew]] or [[Aramaic]] letter beth.<ref name=top10/><ref name=s8int/>
# The Crystal Skull of Lubaantum ([[Belize]]), a 7-inch-long skull cut from a single piece of clear quartz found among Mayan ruins in 1927. The artisan who fashioned it evidently cut the quartz ''against the axis of crystallization'', a feat no modern jeweler could possibly accomplish without shattering the quartz into fine dust. Moreover, even if the artisan could have accomplished the against-the-grain cut, he cannot have used any metal tools, because his work bears no scratch marks. Analysts have concluded that the production of this artifact would have required 300 man-hours using any conceivable modern method—again, ''if'' anyone could have cut the quartz against the grain without shattering it. (One must also wonder what sort of culture would see something as morbid as a skull as an article of jewelry, much less exert such technological effort to produce such an object.)<ref name=top10/>
# The Crystal Skull of Lubaantum ([[Belize]]), a 7-inch-long skull cut from a single piece of clear quartz found among Mayan ruins in 1927. The artisan who fashioned it evidently cut the quartz ''against the axis of crystallization'', a feat no modern jeweler could possibly accomplish without shattering the quartz into fine dust. Moreover, even if the artisan could have accomplished the against-the-grain cut, he cannot have used any metal tools, because his work bears no scratch marks. Analysts have concluded that the production of this artifact would have required 300 man-hours using any conceivable modern method—again, ''if'' anyone could have cut the quartz against the grain without shattering it. (One must also wonder what sort of culture would see something as morbid as a skull as an article of jewelry, much less exert such technological effort to produce such an object.)<ref name=top10/>
# The Cabrera Stones. These are 20,000 stones that appear to be illustrations from a medical textbook. The surgical techniques depicted in these illustrations rival or even far surpass any surgical techniques in use today, and even include encephalic transplantation.<ref name=top10/>
# The Cabrera Stones. These are 20,000 stones that appear to be illustrations from a medical textbook. The surgical techniques depicted in these illustrations rival or even far surpass any surgical techniques in use today, and even include encephalic transplantation.<ref name=top10/><ref name=AncientX/>
=== Modern technology in deep time ===
=== Modern technology in deep time ===