The M1 Abrams was developed in the 1970s for one primary reason: to defeat the new Soviet T-72, which had rendered the U.S. Army’s aging M60 “Patton” tank obsolete. -Chrysler won the $4.9 billion ...

Your home has a complicated layout. A lot of 1970s homes have strange, complicated designs—a sunken living room, a playroom that’s up a few stairs, bedrooms upstairs. Although stair-climbing vacuums ...