Six years ago, we ran a story on hydrogen fuel-cell powered bikes that could travel limited distances, and used canisters of fresh hydrogen to quickly replenish the bike’s energy. Pragma Industries has introduced a much-improved version of that bike, with range up to 150 kilometers (93 miles). A pedelec (the motor kicks in when the cyclist pedals), the bike has a unique look and a compact propulsion system. The system consists of a Brose 36 Volt motor, a 150 Watt PEM (Proton Exchange Membrane) fuel cell, and 150 Watt-hours of lithium-ion batteries in the bike’s down tube. Pragma has a large amount of material on its technologies, including a helpful explanation of fuel cells and their operation, and a great collection of scientific papers on fuel-cell related topics. Business Insider reports, “The firm’s Alpha bike runs for about 100 km (62 miles) on a two-liter tank of hydrogen, a range similar to an electric bike, but a refill …