The tennis brand Wilson began as part of a meatpacking company seeking uses for animal by-products: its first racket strings were made from cow intestines.

Supermarket layouts are designed to make you spend more. Fruit and veg go up front to make you feel healthy, so you can justify junk food later. Essentials like milk, eggs, and bread are tucked away at the back to lure you past snacks.

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.