Source   http://mat.usc.edu/
Related posts:
America has become the world leader in wind power
The Arctic: Life above the polar circle
The State of YouTube [Infographic]
Hamburgers: The Economics of America's Favorite Food
Interactive - Comparison of notable earthquakes
School of Business History Timeline
STD Risk Factors [Infographic]
Women @ Work – Sound Bites, Statistics of Women Who Lead [Infographic]
This is How Your Brain Ages [Infographic]
The World's Most Exports in 2017