Because PF is so active, many interesting threads become lost over the months or years. In order to mark and track these threads for later viewing we've developed the "Highlighted Threads" feature. It will also be useful for finding new interesting threads you may have missed. Over time it will serve as a sort of "Best of PF" reference. These highlighted threads (which are public) will be displayed here: https://www.physicsforums.com On the homepage in the breadcrumb navbar there is a link toggle to switch back and forth between views. "Physics Forums - Switch to Forum view / Highlighted Threads". The usergroups that can highlight a thread are: Staff, Science Advisors, Homework Helpers, Retired Staff, PF Contributors. You'll find a "Highlight Thread" link in the "Thread Tools" dropdown at the thread level. So those with permission, if you come across a thread that is interesting and you'd like to share with others, go ahead and hit "Highlight Thread". A few new highlighted threads a day would be ideal, don't be shy!