Ibn Ezra on Parashat Nitzavim-Vayeilekh, Devarim/Deuteronomy 29:17
I see destructive behavior constantly amplified by echo chambers where this behavior is either ignored or lauded, but never addressed as negative. I see a world where folks are more able than ever before to be siloed away from society, and yet they have greater reach than ever before. I write about this phenomenon a lot, but from a different perspective... and I feel it's one of the most important things we could possibly talk about today.
A smile can be extremely contagious, especially in disagreeable settings (eg at the airport, very late plane, everyone is sulking and complaining - I smile to various people, the mood lightens a bit).