Spectrometry involves shining a light through a sample of material and then analyzing that light to reveal the composition of the materials. It's not exactly in household use - yet. A kickstarter project is planning to distribute $30 spectomoeters that people can use with their iPads. What will they do with them? Examine water for contaminants, snalyse brewed beer or coffee, test soil, and more. Why do I mention this here? It's an example of how ubiquitous computing will enter our lives in unexpected ways, giving us new method to learn about and interact with the world. See also this related article on how your mobile phone is becoming a multi-faceted sensing device.
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