A collection of useful and interesting facts, figures and charts.
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We aim to collect things that are useful, unusual, or tell a story of the human endeavour to understand and categorise the world. Guidelines
We aim to collect things that are useful, unusual, or tell a story of the human endeavour to understand and categorise the world.
Guidelines
Natural and Historic Dyes & Inks
papersizes.io External
Element Symbol Origins
Glass Colours
Ion Names and Charges