3Blue1Brown is the YouTube channel of Grant Sanderson, who studied mathematics at Stanford University and makes animated videos that are "some combination of math and entertainment, depending on your disposition." Visitors can explore Sanderson's most recent videos on the home page or browse for videos of interest on the site's playlist. In one recent video, Sanderson explains cryptocurrencies (such as Bitcoin) and how these currencies work. In another recent video, Sanderson discusses neural networks and their role in machine learning. Other 3Blue1Brown playlists address topics including calculus, linear algebra, and space-filling curves. New viewers may also want to start by checking out the recommended playlist.