H Index - the hot topic of the week

This week I have received questions from 3 faculty about the H index, a concept that was first postulated in 2005 as a way of measuring the impact of a scientist through his/her publications. There is a good article in the Wikipedia that summarizes the H index. I was able to find the H index for these 3 professors using Scopus and the Web of Science. The latter gave a higher value since it covers older publications.