Soccer is one of the most popular sports among girls, Chaudhry said, and its popularity blossomed after U.S. women won the World Cup in 1999. Katy Hardt, 22, who lives in San Francisco, has played soccer since she was little.
TETRA (Terrestrial Trunked Radio) TETRA (Terrestrial Trunked Radio) is a set of standards developed by the European Telecommunications Standardisation Institute (ETSI) that describes a common mobile radio communications infrastructure throughout Europe.
RF (radio frequency) is an electromagnetic wave form that can be distorted by metal and magnetic fields but can travel in a vacuum. ultrasound is a physical wave form that requires a medium to travel in (solid or liquid) and will not travel in a vacuum.