  Radon is a colorless, odorless gas that arises naturally within the ground from the decay of radioactive elements. It is the leading cause of lung cancer among non-smokers. The action level for home exposure is 4 picocuries of radion per liter of air (4 pCi/L).According to the US EPA, the average radon level in American homes is 1.25 pCi/L, and 6 million homes have levels of 4 pCi/L and above. Radon is a colorless, odorless gas that arises naturally within the ground from the decay of radioactive elements. It is the leading cause of lung cancer among non-smokers. The action level for home exposure is 4 picocuries of radion per liter of air (4 pCi/L).
The Straz Center is located downtown on a 9-acre (36,000 m2) site along the east bank of the Hillsborough River. As the second largest performing arts complex in the Southeastern United States (behind the Adrienne Arsht Center for the Performing Arts), the 335,000-square-foot (31,100 m2) venue provides an environment for a variety of events.
more interesting sites The climate of Shiraz (Iran) Shiraz is located in the southern part of Iran in the Faris province at the foot of the Zagros mountain range. The Rudkhaneye Khoshk River flows along the entire northeastern side of the city. This river eventually flows into Lake Maharloo. During large parts of the year this river is dry. Shiraz is an old city.