Why birds can fly over Mount Everest

Acclaimed film editor Walter Murch on oxygen, evolution, and our planet’s fate. Although predominantly known for his pioneering work in The Godfather trilogy and The English Patient, Murch is also acutely interested in science. In this great piece, we follow a lovely letter he wrote to his granddaughter, Bella, wherein he takes her (and us) on a journey through the wonders of Earthly beings and evolution.