Open a phone, a remote, an electronic toy. Inside, always the same green plate. That's a printed circuit board — and the world throws away enough of them to hit 82 million tonnes of electronic waste a...

Forget the internet. The largest network on the planet is a web of fungal threads — the mycelium — growing beneath every field and forest. Scientists just mapped it for the first time in Science, and the scale is almost a joke: 110 quadrillion kilometers of living filaments, nearly a billion times the distance from Earth to the Sun.

Do you remember Avatar? That luminous network of roots connecting all living beings on Pandora—trees, animals, the whole planet communicating through an underground network of light. James Cameron didn't invent...