The Sustainable Development Goals (SDGs) have committed governments to 'leave no one behind' when eradicating poverty and inequality. But with around one billion people still living in extreme poverty, we need better data on the poor and marginalised to achieve these goals. 

Data visionary Hans Rosling, co-founder of Gapminder and professor of international health at Stockholm’s Karolinska Institutet, launches ODI's #DataDay by challenging our perspective on global trends.