Matt Ridley from WSJ on a study of how Libertarians differ cognitively and psychologically from Liberals and Conservatives: The study collated the results of 16 personality surveys and experiments completed by nearly 12,000 self-identified libertarians who visited YourMorals.org. The researchers compared the libertarians to tens of thousands of self-identified liberals and conservatives. It was hardly surprising that the team found that libertarians strongly value liberty, especially the "negative liberty" of freedom from interference by others. Given the philosophy of their heroes, from John Locke and John Stuart Mill to Ayn Rand and Ron Paul, it also comes as no surprise that libertarians are also individualistic, stressing the right and the need for people to stand on their own two feet, rather than the duty of others, or government, to care for people. Perhaps more intriguingly, when libertarians reacted to moral dilemmas and in other tests, they displayed less emot...