Environment

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Craftmark Homes is building 91 single-family homes at Park Ridge in Clarksburg. The Oakton Alternate model, with 4,275 square feet, is priced from $738,900 to $758,900.

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Photo by patrick Michaelyan, Positive Energy LLC The calibrated door blower test is a common diagnostic measure used by firms that conduct energy audits. It helps pinpoint where cracks and poor seals are letting air in and out of a home.

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Quarry Springs at Stoneyhurst in Bethesda will offer 97 condominium homes in four buildings on the site of the oldest working quarry in the region. The homes, with 2,200 to 4,000 finished square feet, will range in price from $1,800,000 to $4,000,000.

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Buyers at Quarry Springs can customize their homes with a choice of walnut, cherry or oak flooring and kitchen cabinets in 10 styles and colors.

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Palmetto trees, the state tree of South Carolina, frame a gas station sign on Folly Beach, S.C., on Monday, May 21, 2012. The Carolinas AAA motor club reported that South Carolina had the cheapest gas in the nation on Monday and prices could drop even more this summer. (AP Photo/Bruce Smith)

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Axis deer are plentiful on the island of Maui in Hawaii, where they have caused considerable damage over the years to the landscape, but now there are an estimated 100 on the Big Island, 30 miles away, and no one knows how they got there. (Forest and Kim Starr via Associated Press)

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Once touted as the "Eighth Wonder of the World," the Astrodome gathers dust on Monday, May 21, 2012, in Houston. (AP Photo/Pat Sullivan)

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Renee Denton, director for medical oncology and pediatrics at Freeman Hospital, releases a lantern Tuesday, May 22, 2012 during Morning Has Broken event at Freeman Hospital. The laterns were in remembrance of the May 22, 2011 tornado victims. The tornado killed 161 people and destroyed one-third of the city, making it the nation's deadliest single tornado in six decades. (AP Photo/The Joplin Globe, Roger Nomer)