“If, years later, I do use the slit detector to observe which way the electron went, it will mean that many years earlier the electron must have passed through one slit or the other. But if I don't ...”

“If I keep observing the uranium, which means a little more than keeping my eyes on the pot on my desk and involves something akin to surrounding it with a whole system of Geiger counters, I can fre...”

“It does appear that some parts of our evolutionary process seem inevitable. It is striking that throughout evolutionary history, the eye evolved independently fifty to a hundred times. This is stro...”

“To understand this new frontier, I will have to try to master one of the most difficult and counterintuitive theories ever recorded in the annals of science: quantum physics. Listen to those who ha...”

“Some might question whether it makes sense to talk about setting up the experiment and running it again with exactly the same conditions--that it is, in fact, impossible. Locally, you might get the...”

“I think science is a foreign land for many people, so I think of my role as an ambassador's job.”

“Dont feel ashamed of working hard! Believe that things will change.”

“Be believing, be happy, don't get discouraged. Things will work out.”

“Hearts will break and people will hurt you, darling. Her mother said. But when you let those people control your outlook on the life, you only allow them to have a greater hold on your happiness. O...”

“He loved her, of course, but better than that, he chose her, day after day. Choice: that was the thing.”

“Happiness, like unhappiness, is a proactive choice.”

“But I don't want comfort. I want God, I want poetry, I want real danger, I want freedom, I want goodness, I want sin.''In fact,' said Mustapha Mond, 'you're claiming the right to be unhappy.' 'All ...”

“There are no conditions to which a person cannot grow accustomed, especially if he sees that everyone around him lives in the same way.”

“In western societies many people become sick in their thirties, develop serious medical conditions in their forties and are disabled in their fifties.”

“Therefore, just as water retains no constant shape, so in warfare there are no constant conditions.”