Two men, 4,600 miles apart, send messages to each other using just their minds

With a blindfold covering his eyes, and earplugs cancelling out almost all sound, Dr Michel Berg sat in a state-of-the-art laboratory at the University of Strasbourg in north-eastern France, and began to think.
Nearly 5,000 miles away, at a research facility in the Indian city of Kerala, a young Spanish man called Dr Alejandro Riera pulled on a tightly fitting hat, placed a laptop computer on a white table, and also began to think.
Over the course of the next hour, on March 28 this year, the 51-year-old Dr Berg and his faraway counterpart would attempt something that had only previously occurred in the exotic realms of science fiction.