Museo Sans

Credit to http://www.fontsquirrel.com/fonts/Museo-Sans

"Museo Sans is based on the well-known Museo.

It is a sturdy, low contrast, geometric, highly legible sans serif typeface very well suited for any display and text use. This OpenType font family offers also support for CE languages and even Esperanto. Besides ligatures, automatic fractions, proportional/tabular lining and old-style figures, numerators, denominators, superiors and inferiors MUSEO also has a ‘case’ feature for case sensitive forms."