Layer 2 scaling solutions have gone through a lot of iterations and disappointing conclusions in the past few years. There is a newer solution, which is boasting some positive (and safe) results: Optimistic Rollups. John Adler, Blockchain Researcher at Consensys, speaks on the history of Layer 2 solutions and describes Optimistic Rollups and how they may help with blockchain scaling.Links:John's TwitterEthresearchFuel LabsLazy Ledger