[Flasutie] faced no such restrictions when building his giant 40 mm foam dart ... Inside the cartridge is a quantity of flammable HHO gas generated, presumably, from water via electrolysis.

The scheme rewarded AFC Energy up to £4.8 M to build hydrogen generators supported with battery storage at off-grid quarry sites in Surrey. Hydrogen is a promising net-zero fuel source ...

Over time, the building blocks join together in the right places to form the final complexes ... Low-cost fuel cells could also drive the development of other hydrogen-powered devices, such as backup ...