The circles represent people per square miles for each Continent.
See (Bubble Chart)[https://github.com/phuonghuynh/bubble-chart/]
forked from phuonghuynh's block: D3 Bubble chart
forked from justlebeau's block: Continential Density Bubbles
forked from alexhoke's block: Bubbles-sizes
forked from greenmna's block: Bubbles-sizes-me
Modified http://phuonghuynh.github.io/js/bower_components/jquery/dist/jquery.min.js to a secure url
Modified http://phuonghuynh.github.io/js/bower_components/d3/d3.min.js to a secure url
Modified http://phuonghuynh.github.io/js/bower_components/d3-transform/src/d3-transform.js to a secure url
Modified http://phuonghuynh.github.io/js/bower_components/cafej/src/extarray.js to a secure url
Modified http://phuonghuynh.github.io/js/bower_components/cafej/src/misc.js to a secure url
Modified http://phuonghuynh.github.io/js/bower_components/cafej/src/micro-observer.js to a secure url
Modified http://phuonghuynh.github.io/js/bower_components/microplugin/src/microplugin.js to a secure url
Modified http://phuonghuynh.github.io/js/bower_components/bubble-chart/src/bubble-chart.js to a secure url
Modified http://phuonghuynh.github.io/js/bower_components/bubble-chart/src/plugins/central-click/central-click.js to a secure url
Modified http://phuonghuynh.github.io/js/bower_components/bubble-chart/src/plugins/lines/lines.js to a secure url
https://phuonghuynh.github.io/js/bower_components/jquery/dist/jquery.min.js
https://phuonghuynh.github.io/js/bower_components/d3/d3.min.js
https://phuonghuynh.github.io/js/bower_components/d3-transform/src/d3-transform.js
https://phuonghuynh.github.io/js/bower_components/cafej/src/extarray.js
https://phuonghuynh.github.io/js/bower_components/cafej/src/misc.js
https://phuonghuynh.github.io/js/bower_components/cafej/src/micro-observer.js
https://phuonghuynh.github.io/js/bower_components/microplugin/src/microplugin.js
https://phuonghuynh.github.io/js/bower_components/bubble-chart/src/bubble-chart.js
https://phuonghuynh.github.io/js/bower_components/bubble-chart/src/plugins/central-click/central-click.js
https://phuonghuynh.github.io/js/bower_components/bubble-chart/src/plugins/lines/lines.js