link for checkboxes: http://www.designrazor.net/animated-css-html-checkbox-examples-tutorial/

Source for Happiness Index data: http://www.happyplanetindex.org/data/

HDI Data: http://hdr.undp.org/en/data

Country centroid data: http://gothos.info/resources/

Incarceration data: http://www.prisonstudies.org/highest-to-lowest/prison_population_rate?field_region_taxonomy_tid=All

GINI Index (income inequality) data: https://en.wikipedia.org/wiki/List_of_countries_by_income_equality

Suicide Rate Data: http://apps.who.int/gho/data/node.main.MHSUICIDE?lang=en

Homocide rate data: https://data.unodc.org/#state:0