One of my friends who is a non-CS concentrator would like to scrape emails of all faculties listed in this website. Unfortunately, the emails are not on the page itself, but are on subpages. It would take forever to scrape the data by hand, so I helped. To do this, I need to send multiple requests to scrape each subpage. Naively, we would send a request, wait for a response, then repeat until we go over all list of faculties. This however would take a lot of time. We can do better by sending requests asynchronously. This is feasible because there is no dependency in the data.