My first undertaking in the way of scientific experiment was in the field of economics and psychology.

Construction of an aerial vehicle which can carry even a single man . . . requires the discovery of some new metal or force. Even with such a discovery, we could not expect one to do more than carry its owner.

The beginning of 1856 found me teaching in the family of a planter named Bryan, residing in Prince George County, Md., some fifteen or twenty miles from Washington.

The time was not yet ripe for the growth of mathematical science among us, and any development that might have taken place in that direction was rudely stopped by the civil war.

I was taught the alphabet by my aunts before I was four years old, and I was reading the Bible in class and beginning geography when I was six.

So far as the economic condition of society and the general mode of living and thinking were concerned, I might claim to have lived in the time of the American Revolution.

One of the most beautiful hypotheses ever propounded in physics is ... the Dynamical Theory of Gases