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TIL Why blueprints are blue. In the mid 1800's, a photo chemical process was developed that enabled copying documents. The blueprinting process deposits blue ferric ferrocyanide in areas that were blank in the original document. Thus, the copy consists of white lines on a blue background.

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4XOeN TIL that the jingu shinto shrine in Ise, Japan has been demolished and rebuilt every 20 years since the year 690. Even the objects inside the shrine are rebuilt except the sacred mirror
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gMQab TIL "Comrade Kim goes Flying" is North Korea’s first “girl power” movie and it was screened at numerous film festivals in 2014. The story of coal miner, her dream of becoming a trapeze artist is crushed by an arrogant trapeze star who believes miners belong underground and not in the air
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