Energy utility Exelon Corp. said Wednesday its second-quarter profit rose 7 percent due in part to better margins at a nuclear unit.

An apparent malfunction in the heating and cooling system of a pool killed 16 stingrays at a suburban Chicago zoo, officials said.

Exelon Corp. said Tuesday that it plans to slash its greenhouse gas emissions and those of its customers within 12 years to levels below what one of the nation's largest power generators currently emits every year.

Nuclear power may indeed be poised for a renaissance as many in the industry hope, but there have been false promises in the past.

As the Dow, Nasdaq and S&P slide into negative territory, CNBC asked the experts how to bolster your investments.