Strava is an American internet service for tracking human exercise which incorporates social network features. It is mostly used for cycling and running using GPS data. Strava uses a freemium model with some features only available in the paid subscription plan. The service was founded in 2009 by Mark Gainey and Michael Horvath and is based in San Francisco, California. == Overview == Strava records data for a user's activities which can then be shared with the user's followers or shared publicly. If an activity is shared publicly, Strava automatically groups activities that occur at the same time...

A heat map (or heatmap) is a data visualization technique that shows magnitude of a phenomenon as color in two dimensions. The variation in color may be by hue or intensity, giving obvious visual cues to the reader about how the phenomenon is clustered or varies over space. There are two fundamentally different categories of heat maps: the cluster heat map and the spatial heat map. In a cluster heat map, magnitudes are laid out into a matrix of fixed cell size whose rows and columns are discrete phenomena and categories, and the sorting of rows and columns is intentional and somewhat arbitrary...

David Foster Wallace (February 21, 1962 – September 12, 2008) was an American author of novels, short stories and essays, and a university professor of English and creative writing. Wallace is widely known for his 1996 novel Infinite Jest, which Time magazine cited as one of the 100 best English-language novels from 1923 to 2005. His posthumous novel, The Pale King (2011), was a finalist for the Pulitzer Prize for Fiction in 2012. The Los Angeles Times's David Ulin called Wallace "one of the most influential and innovative writers of the last twenty years".Wallace grew up in Illinois and attended...