Climbing the world's biggest trees

Science writer Richard Preston talks about some of the most enormous living beings on the planet, the giant trees of the US Pacific Northwest. Growing from a tiny seed, they support vast ecosystems -- and are still, largely, a mystery.

"One hesitates because he feels inferior, another is busy making mistakes and becoming superior."

"Listen or thy tongue will keep thee deaf." Native American

"What is wanted is not the will to believe, but the will to find out, which is the exact opposite." Bertrand Russell

"We make ourselves rich by making our wants few." Henry David Thoreau