Here are the problems: 1) You need to get a group of humans interested in an important topic. 2) The topic is complex. 3) There's a lot of data to share. 4) Human brains have limitations. So the challenge is to tell a story in a way that humans can understand and get behind. To do this, we need to first understand human's powers and challenges when it comes to consuming data. Then we can make better charts, maps, and graphs (aka data visualizations) given what we know about the human brain. And finally, we can present charts in a way that humans can absorb.