"Three months of camp life at Lake Tahoe would restore
an Egyptian mummy to his pristine vigor and give him an appetite like an alligator.
I do not mean the oldest and driest mummies, of course, but the fresher ones.
The air up there in the clouds is very pure and fine, bracing and delicious.
And why shouldn't it be? -- it is the same as angels breathe."

Mark Twain, Roughing It (1871)