There are nine countries in the world that have nuclear weapons. There are about 27,000 nuclear weapons total on the planet. The countries that have nuclear weapons deploy them ready for use and have doctrines saying that they would use them in certain circumstances.

[Theodore Roosevelt] was a naturalist on the broadest grounds, uniting much technical knowledge with knowledge of the daily lives and habits of all forms of wild life. He probably knew tenfold more natural history than all the presidents who had preceded him, and, I think one is safe in saying, more human history also.

Mounting toward the upland again, I pause reverently, as the hush and stillness of twilight come upon the woods. It is the sweetest, ripest hour of the day. And as the hermit's evening hymn goes up from the deep solitude below me, I experience that serene exaltation of sentiment of which music, literature, and religion are but the faint types and symbols.

I am not going to advocate ... the abandoning of the improved modes of travel; but I am going to brag as lustily as I can on behalf of the pedestrian, and show how all the shining angels second and accompany the man who goes afoot, while all the dark spirits are ever looking out for a chance to ride.

The overall quantity of nuclear weapons in the world continues to decline slowly.

I think rain is as necessary to the mind as to vegetation. My very thoughts become thirsty, and crave the moisture.

I go to books and to nature as a bee goes to the flower, for a nectar that I can make into my own honey.