Earlier this month, police in Edmonton, Canada, released a sketch of a suspect. The issue is, no one knows what the suspect looks like.This episode was produced by Siona Peterous, edited by Matt Collette, engineered by Paul Robert Mounsey, and hosted by Sean Rameswaram.Transcript at vox.com/todayexplained  Support Today, Explained by making a financial contribution to Vox! bit.ly/givepodcastsLearn more about your ad choices. Visit podcastchoices.com/adchoices