A $50 (£32) pen called 3Doodler lets you draw three-dimensional shapes using a special plastic 'ink' that hardens almost as soon as it is released from the nib. The pen has a chamber that heats and ...
In our mind’s eye, the universe seems to go on forever. But using geometry we can explore a variety of three-dimensional shapes that offer alternatives to “ordinary” infinite space. When you gaze out ...
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