Some countries have grown a lot, while others remained poor. We look at how incomes have changed around the world and why it matters.

There is a cross-country correlation between democracy and health. Is there good evidence to suggest it is causal?

Where do we find life on earth? Despite being vast, the oceans are home to just 1% of life – but the majority of animals. See how the different lifeforms are split across these global environments.

Malaria has been eliminated from large parts of Europe, the Americas, East Asia, Australia, and the Caribbean.

How is life on Earth distributed across the taxonomic kingdoms? Humans make up just 0.01% of life: but we've had much larger impacts on shaping the animal kingdom. Livestock now outweighs wild mammals and birds ten-fold.

15,000 children die on average every single day. Reducing child mortality is a key target of the Sustainable Development Goals (SDGs). What would it take for the world to reach it?

Global demographic transition signals a shift from young, growing populations to older, stable ones, reshaping societies and economies.

We are one of the few non-profits that Y Combinator has decided to accept.

The number of children in India peaked in the first decade of the 2000s.

Whether inequality is rising or falling depends on where, when, and what aspect of inequality we have in mind.

How has child mortality declined worldwide across the last two centuries?

Life expectancy has doubled over the last two centuries around the world. How has this happened?

The Internet has already changed the world, but the big changes it will bring still lie ahead.

Rinderpest was a disease that primarily infected cattle and buffalo. Thanks to a decades-long international campaign, it was the first animal disease to be eradicated.

More than half of the world live in urban areas, and this will continue to grow.