WHAT YOU NEED: card, compass, scissors, sticky tape, a glass and a jug of water. Image caption, STEP 1: Place a glass at the bottom left corner of the paper. Mark the centre point at the top of the ...
I always find this Siberian diamond mine to be quite impressive. According to Wikipedia, the Mir mine is 525 meters deep with a radius of 600 meters (at the top). It's not the largest excavated hole ...
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