Horizontal lines run left to right, parallel to the horizon, with slope 0 and equation y = k. Vertical lines run top to bottom, perpendicular to the horizon, with undefined slope and equation x = k.

Whether you are sketching graphs in mathematics, understanding directions in geography, or reading blueprints in design class, horizontal and vertical lines are concepts you cannot avoid. They form ...

In a scenario straight out of “The Twilight Zone,” a group of NASA scientists working on an experiment in Antarctica have detected evidence of a parallel universe — where the rules of physics are the ...