I'm taking some time to do keyword research this morning.

I found some interesting keywords -- or did I?

Here are two of the keywords Wordtracker identified:
"human circulatory system diseases"
KEI: 83721.8
Count: 647
24hrs: 521
Competing: 5

"names of heart diseases"
KEI: 485.1
Count: 924
24hrs: 744
Competing: 1760
About a half hour later, I wanted to do an easy visual comparison of a subset of keywords, so I entered a few of the same keywords again.

Note how the results differ in such a short amount of time:
"human circulatory system diseases"
KEI: 0.000
Count: 0
24hrs: 0
Competing: 5

"names of heart diseases"
KEI: 0.000
Count: 0
24hrs: 0
Competing: 1760
There keywords don't look so awesome now, do they?