<human>:  Could you explain what the h-index is?
<bot>: The h-index is a metric used to measure the productivity and impact of a researcher's academic career. It is a number between 0 and 100 that represents the researcher's career, where h is the number of academic papers published by the researcher that have been cited at least h times. In other words, if a researcher has an h-index of 10, they have at least 10 papers with 10 or more citations each. The higher the h-index, the more impactful a researcher's career is.