Nineteen holes ran the length of the bundles, and through these holes the liquid hydrogen flowed for cooling.

Eventually, the hydrogen flows back into the cytoplasm of the mitochondria through protein channels.

Back at the former air station, hydrogen was flowing through the second mini-zeppelin, and what happened left little doubt about the original disaster.

As long as cheap hydrogen flowed through the invisible pipeline across the Solar System, the fusion rockets could fly from world to world, as once the ocean liners had plied the seas of Earth.

Through these lines, oxygen can flow at a maximum rate of 17,600 gallons/min (66,600 l/min) and hydrogen can flow at a maximum rate of 47,400 gallons/min (179,000 l/min).

The hydrogen diffuses and flows back into the cytoplasm through protein channels.

The hydrogen subsequently flowed properly into the fuel cell, Mr. Pennington said, allowing electricity to be generated for the rest of the mission.

Once they were up and clear of the tube, more hydrogen would flow into the bag and fill it out.

Iain Woolward, Nanoco's chief executive, expects quantum dots to be used next year to make multicolored atomic-scale labels for security applications and for sensing hydrogen flows in fuel cells.

Heat absorbed from the liquid nitrogen would convert the hydrogen to a gas or a slushy mixture of gas and liquid, and the warmed hydrogen would flow to the engine for burning.