The heart is the hardest-working muscle in the body. And it uses similar tricks to the brain.

The heart and the mind are closely connected and – when things go wrong – can make each other sick.

Our heartbeat adjusts in a fraction of a second, whether we're making a vow of love or facing a dangerous situation. And it influences our perception.

The heart and brain are a powerhouse duo. Now, the system is being studied using state-of-the-art methods.