18-S190s20-th.gif

Alt text:
Stick figure pointing at graph with "Time" on x-axis and "Bad Stuff" on y-axis
Caption:
It’s important to consider a variety of possible scenarios when looking at data to potentially predict the future. (Courtesy of Randall Munroe. License: CC-BY-NC.)
Stick figure pointing at graph with "Time" on x-axis and "Bad Stuff" on y-axis