The Secret of Trees
What do trees know that we don't? 13-year-old inventor Aiden set out to find out.
William Kamkwamba is a Malawian engineer, TED speaker, and memoirist who built his first windmill from junkyard scraps to help his struggling family farm.
Paul Munsen Solar Oven Man
Solar Oven Man
manufactures sun ovens, which harness the sun's rays to provide an environmentally safe source of energy.