In the '60s, the Beatles took a break from rock 'n roll and turned to Maharishi Mahesh Yogi for spiritual guidance. This Indian guru introduced them to Transcendental Meditation. He also brought this form of meditation to the Western world. Critics dismiss Transcendental Meditation as being quasi-religious nonsense - a cult, a religious practise, even an outright sham. But does it have the health benefits that its advocates insist can enhance wellbeing? Carte Blanche Medical investigates what science has revealed about an ancient Indian tradition that is today practised by over six million people worldwide.