Jon Christensen threw the bomb and plenty of people registered the blast. “Muir’s a dead end,” he told L.A. Times reporter Louis Sahagun last week. “It’s time to bury his legacy and move on.” More than 170 comments on the piece include “I hope these two guys aren’t actually teaching our children,” referring also to Glen MacDonald, John Muir chair in geography at UCLA. I got to take part in MacDonald’s November 13 symposium considering the legacy of John Muir as we come up on