From the archives: We often think of ourselves as the pinnacle of life on the planet. But the largest and tallest living organisms are very different from us. They’re the magnificent coastal redwoods of Northern California. Author Richard Preston was our guest in May. He profiles the trees, their explorers and the lost ecosystems they inhabit and foster among their branches in his book “The Wild Trees: A Story of Passion and Daring” (Random House, 2007).