Many believe that artificial photosynthesis could produce enough hydrogen over the long term to launch a «hydrogen economy» in which all vehicles could run on hydrogen - powered fuel cells. (treehugger.com)
During or after a recharge, the battery might generate enough hydrogen gas to cause an explosion. (scientificamerican.com)
Without physicists we would not have moon rocks or enough hydrogen bombs to destroy the planet several times over. (religion.blogs.cnn.com)