The great dream of cars running on sustainable petrol has not bitten the dust. Here's why.
A visitor pauses at the Vietnam War Memorial in Washington, D.C.
AP Photo/J. David Ake, File
An Army veteran and professor of rhetoric explores poetry written by veterans about a divisive holiday born of the Civil War.
American troops drive French Renault FT tanks to the battle line in the Forest of Argonne, France, September 26, 1918.
U.S. National Archives and Records Administration
America's longstanding tradition of isolationism meant that in 1917 U.S. forces needed a lot of support from overseas allies to fight effectively.
The USS Gerald Ford in Newport News, Virginia, cost nearly $13 billion to build.
AP Photo/Steve Helber
Does the president's specified goal of 350 ships meet the needs of the nation in the 21st century? The answer is not yet clear.
HMAS Perth was sunk on March 1 1942.
Shinatria Adhityatama / Pusat Arkaeologi Nasional (Arkenas)
Sunken World War II warships, the final resting place for thousands of sailors, have been disappearing in Indonesia. But so far there's been little action taken to ensure their protection.
Megyn Kelly during a Republican presidential primary debate in Iowa, January 2016.
AP Photo/Chris Carlson, File
Megyn Kelly's account of Fox News Chief Roger Ailes' sexually predatory behavior has put harassment back in headlines. Can public debate on this issue make a difference?
The USS Roosevelt sails the South China Sea.
In the summer of 2007, in a bizarre incident shown live on Russian television, scientists accompanied by a couple of senior politicians descended 4,300 meters to the floor of the Arctic Ocean in two Mir…