One resolution I have made, and try always to keep, is this: ‘To rise above little things’.

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.

The place to observe nature is where you are.

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.

Science is a capital or fund perpetually reinvested; it accumulates, rolls up, is carried forward by every new man. Every man of science has all the science before him to go upon, to set himself up in business with. What an enormous sum Darwin availed himself of and reinvested! Not so in literature; to every poet, to every artist, it is still the first day of creation, so far as the essentials of his task are concerned. Literature is not so much a fund to be reinvested as it is a crop to be ever new-grown.

Travel and society polish one, but a rolling stone gathers no moss, and a little moss is a good thing on a man.

I seldom go into a natural history museum without feeling as if I were attending a funeral.