The brain is perhaps the only organ whose function is still a bit of a mystery. It contains around 100 billion neurons.
The brain doesn’t have pain receptors, in other words, it can interpret pain signals, but it cannot feel pain.
The brain has a memory of around 100 terabytes which makes it a super-computer.
Unfortunately, the opinion that we use only a small part of its ability is just a myth, we use it all, we actually even use about 10% of it when we sleep.