Word: oxygenate
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Unlike an internal combustion engine, which burns its fuel so inefficiently that only 20 percent of the energy in gasoline gets used, a fuel cell can pull off at least 30 percent efficiency by reacting its special fuels--hydrogen and oxygen gas--electrochemically...
...practice, the equation isn't so spotless. Though oxygen is plentiful in the air, pure hydrogen is much harder to come by and must be obtained artificially...
...pollution levels of fuel cells, while seemingly their raison d'etre, is also their most damning flaw. A fuel cell is a highly efficient reactor, but is notoriously picky about what it consumes--only pure hydrogen and oxygen...
...similar process produced the even deadlier toxin of botulinum bacteria, but because oxygen kills these germs, they were grown in a fermenter infused with nitrogen. Botulism is a severe kind of food poisoning that causes paralysis and death. The Iraqis also used the castor-bean plant, widely grown in the country, to produce the poison ricin, which kills by altering the body's use of proteins and causing circulatory collapse and heart failure...
...above 70,000 feet. Its cruising speed is a relatively slow 430 m.p.h., which can make it vulnerable (seven have been shot down), and its range is more than 4,000 miles. Dress code for pilots: a full-pressure astronaut-like suit when flying. They breathe 100% oxygen and wear UCDs--urinary-collection devices--for obvious reasons...