Links to datasets
Students should feel free to search for other data sources by looking for research articles, but often the raw data that a paper's results are based on, are not
available. So, for example, this article on contact nerwork from a US high school:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3009790/
has data available in supplementary info; but this is not always the
case.