But it's not just Rosling who's changing his global income vocabulary. The World Bank now uses a similar four-tiered system to talk about income levels, too. And Gates wants to be next.

Household health improves and over time you begin to see the hallmarks of what we associate with “First World” living standards: longer life spans, fewer children, higher levels of income and ...

Rosling adds nuance to the global socio-economic picture by outlining four income levels, from US$1 a day to more than $64.

It's a project that catalogs everyday objects — like toys, soap, stoves and of course, toilets — to provide a snapshot of life at different income levels across the globe.

"Dollar Street" shows photos of homes at different income levels around the world.

You’d be forgiven for thinking the world is all doom and gloom – and getting worse. But these seven charts show that’s not actually the case.

TIME: You’ve called Hans Rosling’s Factfulness “one of the most important books I’ve ever read.” What makes it so significant?

Alan Smith looks at the genius of the late Hans Rosling, and how he popularised the use of bubble charts for visualising demographic data.

Hans Rosling, co-founder of the Gapminder Foundation, visualizes global health trends and population numbers — transforming dry poverty and development statistics into Internet sensations. In ...

Hans Rosling is probably the only academic who ends his PowerPoint presentation by swallowing a sword. He does this while wearing a muscle-T bedazzled with lightning bolts made from shiny, gold ...