Control your phone by stroking your hair. It's a technology invented by Katia Vega of the Pontifical Catholic University of Rio de Janeiro, who explains: "we add new functionalities to hair extensions, turning them into a seamless device that recognizes auto-contact behaviors concealed to outside observers."
This is obviously a technology invented by someone who has lots of hair. Useless for us hairless types. Though she does say she has plans for a way of controlling apps by stroking your beard.