Biology

A lack of this vital nutrient is one of the world's leading causes of disability – but exactly when it becomes a problem, and the best way to treat it, remains unclear.

Being too hot or too cold can be bad for your health. So, what is the optimum temperature for your home?

The ideal poo is a 'type 3' or 'type 4' – cracked or smooth sausage – delivered once per day.

Solitary lifestyles can have some big advantages in the animal world. Can humans learn anything from them?

Some species of birds like geese save energy by flying in close formation. Airliners could use a similar trick to burn less fuel.

The world's largest invertebrate remained hidden from humanity until a tantalising glimpse 100 years ago. But it would be decades before we come face to face with the colossal squid.

The breeds show different reaction to clocks going back and forward, a study suggests.

It can be difficult to find motivation to keep fit when it's cold and dark outside. Here are some expert tips on how to stay active during the winter months.