Readers discuss a guest essay about birthrates and the world’s population. Also: A citizens’ celebration for America’s 250th ...

For centuries, we’ve imagined Neanderthals as distant cousins — a separate species that vanished long ago. But thanks to ...

There is a day for just about anything, including the world's population. Did you know that Every July 11th is World ...

Sri Lanka’s estimated poverty (share of the population living on less than $3.65 a day) remains stubbornly high, affecting as ...

The world's population is expected to peak at 10.3 billion in 2084 and then decline to 10.2 billion through the end of the ...

Sprawl made suburbia affordable. Now it’s breaking it. Here’s what a new vision of the suburbs could look like.