This is probably old hat to everyone- but I recently discovered Google’s NGram Viewer, which can compile a line graph of specific words published in books on a timeline.
You could graph specific words against each other, like comparing medicine, public health, and demography against each other. Even cooler is that you can specify specific datapoints, say 1800-2016. Or, 1800-1900.
It is a pretty elegant feature, it can show how our understand of subject areas have changed over time.
It’s simplicity could be useful for people wanting to generate simple and elegant figures for presentations and classes, etc.