With technology making huge advancements every minute, have you ever wonder what the world will be like if the tattoos on your body controlled your smartphones. Well, you don't really need to wait for the future for this to happen. german scientists have developed skin marks, ultra thin temporary electronic tattoos and you can touch, squeeze or slide fingers to operate it. Well, the phrase 'beauty is skin deep' just got a makeover. To know how it works watch the video.