We've been in a period of relative stability and cooperation since the end of the Cold War among the world's major powers, but that may not always exist. And certainly one could even predict that there will be periods of hostility or tension ahead.

There is an international treaty framework for this. It's the Nuclear Non-Proliferation Treaty (NPT). Most countries in the world are members of the treaty.

[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.

If you think you can do it, you can.

The lure of the distant and the difficult is deceptive. The great opportunity is where you are.

Oh, Spring is surely coming, Her couriers fill the air; Each morn are new arrivals, Each night her ways prepare; I scent her fragrant garments, Her foot is on the stair.

The atmosphere of our time is fast being cleared of the fumes and deadly gases that arose during the carboniferous age of theology.