April 2020 Fruit Trenches: Cultivating Subtropical Plants in Freezing Temperatures Obsolete Technology
October 2012 Electric Velomobiles: as Fast and Comfortable as Automobiles, but 80 times more Efficient Low-tech Solutions
May 2011 Pedal Powered Farms and Factories: The Forgotten Future of the Stationary Bicycle Low-tech Solutions
September 2010 Piston-powered aircraft from the 1950s were as fuel-efficient as the current average jet High-tech Problems
October 2009 Wind Powered Factories: History (and Future) of Industrial Windmills Obsolete Technology