Dolphins, healing therapy...
There are trips which take incurable patients for a swim with dolphins, and these trips are believed to be able to cure their illnesses because dolphins are thought to bring forth ultrasonic sounds which have a healing function.
The myth about the healing therapy of dolphins can be explained as followed. Humans generally have a very strong willpower and this willpower is very important if one wants to achieve something. Let's say someone who has got cancer went to swim with a dolphin and he or she is convinced that this dolphin will cure his illness. Fueled by his own belief, his willpower to get well has increased and this will increase the chance that he will actually recover.

Dolphin resque...
Many people also suggested that dolphins have a special liking for humans, meaning also that dolphins can get attached to a particular person. There was a dolphin who at first contact with a man constantly swam to him and implied that it wanted to be stroked. Once the man stroked it, he saw tears in its eyes, like it was crying with pleasure.
Just like humans can save other people from drowning, dolphins can do the same as well. There are also recent stories of people-saving dolphins. Is this because they want to be helpful, or is it instinct? People have also seen that they bring mattresses and other dolphins to shore. This innate behaviour makes it understandable that dolphins occasionally save people.

Dolphin intelligence, similar to humans?
There has been a lot of research on the behaviour of dolphins. It seems that they have a lot in common with humans. If a dolphin is given a mirror to see itself, it pays attention to its looks. If for example, a black circle is stuck to its side, it will look at it with disgust.
So the big question now is: Why do dolphins do things that humans usually do? Are they really that intelligent?

Dolphins are surely intelligent creatures. But it is doubtful whether their intellectual capabilites exceed that of humans. Some say it is and others deny it. We have not come to a conclusion at this point of time. However, most people agree that the intelligence of a dolphin is comparable to that of a monkey.