There is evidence that some microbial life had migrated from the Earth's oceans to land by 2.75 billion years ago, though many scientists believe such land-based life was limited because the ozone layer that shields against ultraviolet radiation did not form until hundreds of millions years later.
Refueling U.S. Navy vessels, at sea and underway, is a costly endeavor in terms of logistics, time, fiscal constraints and threats to national security and sailors at sea.
On Saturday, the United States Senate confirmed the nomination of Kevin Washburn for the position of Assistant Secretary for Indian Affairs within the Department of the Interior.
Alaska's Governor Sean Parnell visited the State Emergency Operations Center on Thursday before going out via helicopter to survey the extent of the flooding damage on Friday.