After a two-year break, Allen & Co.'s annual Sun Valley conference starts Tuesday with CEOs from Apple, Facebook, Amazon, and Netflix attending (Joe Pompeo/Vanity Fair)

Joe Pompeo / Vanity Fair:
After a two-year break, Allen & Co.'s annual Sun Valley conference starts Tuesday with CEOs from Apple, Facebook, Amazon, and Netflix attending  —  All around, even as the Delta variant begins to sink its teeth into unvaccinated pockets of the U.S., there are signs of life getting …