Chińczycy zrekonstruowali 2000-letni wynalazek. To zapomniana technologia, w którą wielu nie wierzyło

Chińscy badacze podjęli się rekonstrukcji legendarnego sejsmografu, którego pierwotnym twórcą był Zhang Heng. Instrument ten jest uznawany za pierwszy na

Roman dodecahedron

A Roman dodecahedron or Gallo-Roman dodecahedron is a type of small hollow object made of copper alloy which has been cast into a regular dodecahedral shape with twelve flat pentagonal faces. Each face has a circular hole of varying diameter in the middle, the holes connecting to the hollow center, and each corner has a protruding knob. They rarely show signs of wear, and do not have any inscribed numbers or letters. Since the first known example was recorded in 1739, over one hundred such objects have been discovered, dating from the 2nd to 4th centuries AD. Their purpose or meaning has been long debated but remains unknown. Description Roman dodecahedra are cast in metal, usually a copper alloy. They are in the shape of regular dodecahedra, with the addition of a small metal ball at each vertex; each face has a circular hole in the centre. The dodecahedra vary in size from 4 to 11 cm...

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