How can graphs and charts mislead us if we are not careful?

A good chart is an honest friend. It takes a pile of confusing numbers and turns them into a shape your eyes can grasp in a second. But here's the twist: the very same chart can be dressed up to fool you — without telling a single lie. Same numbers, sneaky outfit. Let's catch a few in the act.
Trick number one: the cut-off bottom. Most bar charts start counting at zero. But snip that bottom off, and a tiny difference suddenly looks enormous. Imagine two towers that are really 99 and 100 floors tall — almost the same. Chop the picture so it only shows floors 98 to 100, and now one tower looks like it towers over the other. The numbers didn't change. The starting line did.
