“Our ancestors lived in groups of no more than a few hundred people, and those on the other side of a river or mountain range might as well have been living in a separate world. We developed ethical principles to help us to deal with problems within our community, not to help those outside it. The harms that it was considered wrong to cause were generally clear and well defined. We developed inhibitions against, and emotional responses to, such actions, and these instinctive or emotional reactions still form the basis for much of our moral thinking.”

“My own view is that being a vegetarian or vegan is not an end in itself, but a means towards reducing both human and animal suffering and leaving a habitable planet to future generations.”

“If people are prepared to eat locally and seasonally, then they probably do pretty well in terms of environmental impact.”

“I can tell you that too much money is corrupting American politics. Don't blame the American public. The U.S. Supreme Court has a lot to answer for, because it has made it impossible for Congress to reduce the corrupting influence of money on American political life.”

“The new freedom of expression brought by the Internet goes far beyond politics. People relate to each other in new ways, posing questions about how we should respond to people when all that we know about them is what we have learned through a medium that permits all kinds of anonymity and deception.”

“Google has withdrawn from China, arguing that it is no longer willing to design its search engine to block information that the Chinese government does not wish its citizens to have. In liberal democracies around the world, this decision has generally been greeted with enthusiasm.”

“Most of the robots being developed for home use are functional in design - Gecko's homecare robot looks rather like the Star Wars robot R2-D2. Honda and Sony are designing robots that look more like the same movie's 'android' C-3PO.”

“What is faith? If you believe something because you have evidence for it, or rational argument, that is not faith. So faith seems to be believing something despite the absence of evidence or rational argument for it.”

“Every profession will have its rogues, of course, no matter what oaths are sworn, but many health care professionals have a real commitment to serving the best interests of their clients.”

“In the real world, 90% of the money spent on medical research is focused on conditions that are responsible for just 10% of the deaths and disability caused by diseases globally.”

“In an ideal world, the amount of money we spend on medical research to prevent or cure a disease would be proportional to its seriousness and the number of people who suffer from it.”