Mongolia is the most sparsely populated country — 2 people per square kilometer

Mandarin Chinese is the most spoken first language — about 920 million native speakers

Mandarin Chinese has approximately 920 million native speakers

There are about 7,000 languages in the world — one goes extinct roughly every two weeks

Languages face extinction at a rate of approximately 14 per year

What mathematical model can be used to predict the optimal location for a new capital city based on factors such as population distribution, geographical features, and economic activity?

Spatial econometrics model incorporating gravity, distance decay, and accessibility indices

A single teaspoon of soil contains more microorganisms than people on Earth

"One teaspoon of soil hosts more microbes than Earth's human population."

The Caspian Sea is the world's largest lake — technically not a sea despite the name

The Caspian Sea is the world's largest inland body of water, not a sea

The Sun makes up 99.86% of all mass in the solar system

The Sun constitutes 99.86% of the solar system's total mass