Mandarin Chinese is the most spoken first language — about 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

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

Mongolia has a population density of approximately 2 people per square kilometer

Basque is a language isolate — unrelated to any other known language on Earth

Basque is a language isolate, not related to any other language family

A prime number cannot be divided evenly by any number except 1 and itself — the largest known has 24 million digits

Prime numbers are indivisible by any number other than 1 and themselves, with the largest known having 24 million digits

The strongest muscle relative to its size is the masseter (jaw muscle)

Masseter: Strongest muscle by size, vital for mastication

Sharks are older than trees — sharks appeared about 400 million years ago, trees about 350 million

Sharks existed approximately 400 million years ago, predating trees by 50 million years