Households at the top saw the biggest gains. Those at the bottom stagnated. But what about the people in between? Here's the story of income inequality in America over the past 40 years. Hover over ...

If you understand the definition of a mathematical function, a good way to judge it is that any line drawn parallel to the y-axis intersects with the values in the function’s curve only once. The same ...

The ease with which you can create a line graph in Excel on your PC or Mac will do much to dispel the misconception that the program is arcane and unapproachable. With just three clicks of a mouse (or ...