[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"exercise-B2-1040":3},{"preview":4,"open":13,"missing":31},{"id":5,"number":6,"total":6,"level":7,"course":8,"activity":9,"discriminator":10,"title":11,"slug":12,"instructions":13,"excerpt":14,"prompts":15,"lock":18,"access":19,"updated":20,"previous_id":21,"next_id":13,"previous":22,"next":13,"first":26},1040,83,"B2","reading","long_text","reading_long_text","The Invention of Blue","the-invention-of-blue",null,"Of all the colours in the visible spectrum, blue occupies a uniquely puzzling position in human history. It is the colour of the sky and the sea, yet for most of recorded civilisation it was remarkably difficult to produce as a pigment, a dye, or even as a concept in language. Linguistic studies have revealed that…",[16,17],"What does the writer find surprising about the colour blue in ancient times?","Why was Egyptian blue historically significant?","login","pro","2026-10-02T14:14:49",1039,{"id":21,"number":23,"title":24,"slug":25},82,"The Psychology of Queuing","the-psychology-of-queuing",{"id":27,"number":28,"title":29,"slug":30},958,1,"On the Trail of Bigfoot","on-the-trail-of-bigfoot",false]