How do you conserve an ancient wedge of giant ... after the tree was felled in California. After more than a century on public display as part of the Museum's botany collections, it needed cleaning ...

That is, this tree is so big you can scarcely look at it all. It has a name, the President, bestowed about 90 years ago by admiring humans. It’s a giant sequoia, a member of Sequoiadendron ...