Graphs in Microsoft Excel typically chart time on the horizontal axis. Time is the independent variable in most relationships and dependent variables appear on the vertical axis. Some charts, though, ...

A time graph is a line graph which shows you data that has been collected over a period of time. There is a title which tells you what the data in the time graph is about. The horizontal (X) and ...

With graceful, sail-like blades that turned in the wind like white corkscrews, Helix Wind's vertical axis wind turbines (VAWTs) captured the imagination of bloggers and the tech press in 2007. The San ...