Comet Actors in Lift.
One of my favorite features in Lift is Comet Actors, I love how easy they are to reason about, and they work great.
I went ahead and recorded a presentation which focuses just on comet actors. They are split into 3 videos and I hope you find them useful.
All 3 videos in a playlist:
The slides are on Google Drive (they are all 3 parts in one file.)