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...work to keep our skin safe...Why does our skin get harmed by the sun? Three kinds of ultraviolet (UV) light come from the sun: [three types of UV rays emitted from the sun] Ultraviolet A (UVA) rays are the longest of the three with wavelengths (400-315 nanometers) that penetrate deep into the layers of skin causing tissue damage and wrinkling. Ultraviolet B (UVB) rays...

...worked for NASA In the second example, we consider prosopography as a way to view communities of mathematicians whose presence in archives and historical records are more obscure. Using the example of the West Computing Group at the National Advisory Committee for Aeronautics in the USA, expertly treated by Margot Lee Shetterley in her book Hidden Figures, we showcased...

...working machines. Finally, there are security risks. Many older voting systems rely on outdated operating systems, like Windows XP and 2000, which are no longer supported. Several election officials told us that they stockpile refurbished laptops that can run obsolete versions of Windows. Sherry Poland, director of elections in Hamilton County, Ohio, told us that she...

...worked once”, as she describes it. One place that has managed to break this pattern is Northern Ireland, which has overcome the problem of poor labelling of lines such as intravenous lines and urinary catheters. A sick patient may have several different lines attached to them; these were not labelled in any consistent way – if at all – so a nurse might use the wrong...