Every day I remind myself that my inner and outer life are based on the labors of other men, living and dead, and that I must exert myself in order to give in the same measure as I have received and am still receiving.

Every description of events in space involves the use of a rigid body to which such events have to be referred. The resulting relationship takes for granted that the laws of Euclidean geometry hold for "distances;" the "distance" being represented physically by means of the convention of two marks on a rigid body.

We know what the Earth was like 5 or 6 degrees centigrade colder. That was called the Ice Ages. Imagine a world 5 degrees warmer. The desert lines would be dramatically changed. The West is projected to be in drought conditions. And certain tipping points might be triggered. We can adapt to 1 or 2 degrees. More than that, there is no adaptation strategy.

We're in the great ship Titanic, the Earth is, and it's going to take a half century to really turn the ship.

We need better technologies. But I'm pretty confident that we can figure this out. Necessity is the mother of a lot of inventions.

We now make refrigerators that are four times more energy-efficient than the refrigerators of 1975—for half the inflation-adjusted cost. The energy we save with these refrigerators is more than all of the wind and solar photovoltaic energy we produce in the United States today. Just refrigerators.

Technology is making gestures precise and brutal, and with them men.

biometrics is concerned with keeping people in or out: of buildings; of websites; of countries. It is a method of controlling the chaos of movement, of protecting capital from contagion – the harmful touch of an unauthorized ingress – and streamlining the flow for those with the right password.

I see no good reasons why the views given in this volume should shock the religious feeling of anyone.

A fact is in itself nothing. It is valuable only for the idea attached to it, or for the proof which it furnishes.