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 * [Groovy - Com exemplos] (http://mosampaio.github.io/groovy-workshop) by [@mosampaio](https://github.com/mosampaio)
 * [Mathematics Videos presented in a video box] (http://www.echteinfach.tv/videobox/) by [Echt Einfach TV](http://www.echteinfach.tv/) (implemented loading of youtube iframes only when slide appears)
 * [Bootstrapping Groovy] (http://P7h.github.io/Groovy) by Prashanth Babu ([@P7h](https://github.com/P7h)).
-* [Data visualization for the web with D3.js: So long pie charts](http://ptamarit.com/slides-data-viz-web-d3/) by [Pablo Tamarit](https://github.com/ptamarit) (with [D3 transitions triggered by reveal fragments](http://ptamarit.com/slides-data-viz-web-d3/en/#/example-bind-result))
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+* [Data visualization for the web with D3.js: So long pie charts](http://ptamarit.com/slides-data-viz-web-d3/) by [Pablo Tamarit](https://github.com/ptamarit) (with [D3 transitions triggered by reveal fragments](http://ptamarit.com/slides-data-viz-web-d3/en/#/example-bind-result))
+* [Introduction to Big Data: Using Hadoop and MapReduce](http://rodxavier.github.io/acm-big-data/#/) by [Rod Xavier Bondoc](https://twitter.com/rodxavier14)
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