Let's reuse the example from the Dec. 19 column -- a mixture of 60 percent sand, 20 percent clay and 20 percent silt. On the clay axis, which is the left side of the chart, find the 20 percent mark.

Development of Pyramids Gallery. By Dr Joyce Tyldesley Last updated 2011-02-17. Egypt's pyramids served as tombs for her dead kings. The focus of a complex of ritual buildings, the pyramid was the ...

Three-dimensional charts may be a little more eye-catching and dynamic than their 2-D counterparts (it's an Avatar world, baby), but data visualizat ...