The word 'hello' first appeared in writing in 1826, but wasn’t used as a greeting until 1877 - when it became the standard way to answer the telephone.

Over 80% of the world’s population has never taken a flight.

Astronauts cannot burp in space because the lack of gravity prevents food and gas from separating in the stomach as they do on Earth. Their diet is carefully designed to avoid foods that produce excess gas.

Otters have a favourite rock, often passed down through generations. They keep it in a built-in pocket under their forearms, using it to crack open shells and access food. They also play with it.

Live brown frogs were kept in fresh milk to prevent spoilage in rural Russia during the 19th century. Scientists recently discovered that the frogs' skin secretes antimicrobial properties that kill bacteria and slow spoilage effectively.

Bangladesh experiences six distinct seasons: Grishmo (summer), Borsha (rainy), Shorot (fall), Hemanta (cool), Sheet (winter), and Boshanto (spring).

Komodo dragons and beavers have iron-plated teeth, a feature that enhances the durability and strength of their teeth for specialized tasks.