Hydrogen is locked up in enormous quantities in water (H 2 O), hydrocarbons (such as methane, CH 4), and other organic matter. One of the challenges of using hydrogen as a fuel comes from being able to efficiently extract hydrogen from these compounds.
Zephyrhills is a city in Pasco County, Florida. The population was 10,833 at the 2000 census. According to the U.S. Census Bureau's 2004 estimates, the city had a population of 11,854. It is a suburb of the Tampa Bay Metropolitan Statistical Area. Zephyrhills is also known as the headquarters of the Zephyrhills bottled water company. As of the census of 2000, there were 10,833 people, 4,944 households, and 2,986 families residing in the city. The population density was 1,728.2 inhabitants per square mile (667.1/kmÂ²).
Allen County, Kentucky. Not to be confused with Allen, Kentucky. Allen County is a county located in the U.S. state of Kentucky. As of the 2010 census, the population was 19,956. Its county seat is Scottsville. The county is named for Colonel John Allen, a state senator and soldier who was killed leading the 1st Regiment of Kentucky Rifleman at the Battle of Frenchtown, Michigan during the War of 1812.