By Graeme Murray Science cannot explain everything – and some human beings do indeed seem to possess real superpowers. A small number of people across the globe have powers which so far have proved impossible to explain. Some use sonar to combat the blindness with which they were born, others live for 50 years allegedly without sleep or are even able to survive with no food or water. Many have carved out careers and become famous off the back of their unusual abilities that have astonished doctors and amazed their families. Some of the amazing behaviours of the so-called “superhumans” are list…