Women who suspect men don't feel their pain have a new ally – a Japanese-British artist named Sputniko!, a recent graduate from the Royal College of Art's highly regardedDesign Interactions course. Her Menstruation Machine, worn around the waist, not only gives the wearer painful cramps, it drips around 80ml of blood per day. Poised between conceptual art and product design, it seems unlikely that it will reach mass production any time soon, but it is appearing at New York's MoMA in July. This is Sputniko!'s own video