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How blueprints work

A blueprint is a paper-based reproduction of a drawing, usually a technical drawing. Blueprints use the cyano-type process whereby the paper (or plastic) is coated with a solution of two soluble iron(III) salts, potassium hexacyanoferrate(III) and iron(III) ammonium citrate. 155 more words


Can sunshine be as addictive as heroin?

If recent media reports are to be believed, then sunshine can be “as addictive as heroin.” Although the study on which the reports were based was carried out on mice, the claims were surprising as sunlight does not typically fall into┬áthe list of common addictions such as cigarettes or alcohol. 1,517 more words