Home > Pic of the Day Bikerumor Pic Of The Day: Critical Mass Theory Written by Kristi Benedict Jan 06, 2010 8:01 a.m. ET Click to share on Facebook (Opens in new window)Click to email a link to a friend (Opens in new window) Support us! Bikerumor may earn a small commission from affiliate links in this article. Learn More “Critical Mass theory 🙂” by GriN000. To see more Pics of the Day,Ã‚Â click here, and to submit your own photo to be shown to the world,Ã‚Â go here.