Robot Boats Leave Autonomous Cars in Their Wake

Four hun­dred years af­ter the trans-At­lantic cross­ing of the Mayflower, a ship of the same name will re­trace its his­toric voy­age. But while the orig­i­nal Mayflower bore 102 pas­sen­gers to Ply­mouth Rock, this one will ply the seas for about two weeks next spring with no liv­ing souls aboard.