Do some humans really have a sixth sense? What is it?

Surely you've heard about the sixth sense, but I believe the information which you know about it is not clear, then I will give you the clearest information:
One of my friends have sixth sense told me that: In fact She believe we all have it in us. Some are just more intuitive, there for making them more in tune with their ability/abilities. Intuition in itself is kind of like a sixth sense. Everyone is different but in her case she can feel when things are about to happen or change, She can channel certain people's feelings or thoughts sometimes but mainly with people She am close to, but some She is not close to as well, almost like a telepathic connection. She can also control the energy of her surroundings by projecting her feelings. Even if She seem completely normal on the outside, her friends can feel a heavy energy if She is not ok on the inside. She can sense spirits, She has also had a few experiences where She has predicted death before it happened and both were people She didn't know personally.  These things aren't as cool or crazy as moving objects with your mind but they are forms of a sixth sense. It's all based on intuition and how in tune with the universe, including the spiritual realm you are. Well, at least that's how it is in her case. 
The things which she told me made me more trust in the existence of the sixth sense of humans.
As I know, humans have 21 conventional senses; not the five we were all taught about in school. Subtle energy sensing and other psychic sensing abilities would be in addition to those.

Think about it - you know about sight, hearing, smell, taste, and touch - but what about your sense of balance? Your ability to sense pressure, or temperature? These are all additional senses. Some humans just have a few more, yes. 

I believe humans have a sixth sense. It is our ability to percieve the subtle dimension or the unseen world i.e the world oh ghosts, demons, angels etc. It is also our ability to understand the cause and effect relationship behind many events ehich is beyond the understanding of the intellect. Aka: ESP (Extra sensory perception). Clairvoyance, premonition, intuition are synonymous with sixth sense and subtle perception ability interchangeably.

To make a long story short....it is something like a superpower or something.