Ann Makosinski shows off her flashlight that is powered by body heat in Vancouver on August 6, 2015. A spot on Forbes magazine’s top-30-under-30 list is just the latest accolade for 19-year-old inventor Ann Makosinski, who has a full plate with second-year classes at the University of B.C., speaking engagements around the world and efforts to bring her two inventions – a flashlight powered by body heat and a coffee mug that charges mobile phones – to market.