About 70% of what I've written about is centered on the clashes and conformities between the emerging life and physical sciences and older metaphysical frameworks in the 17th and 18th centuries. The other 30% consists of one-off essays or researches into other intriguing contemporary topics such as visual experience, aesthetics, social justice issues, and the epistemology of moral knowledge.

I have to say that some philosophers such as the late Bernard Williams, and I would include myself in this group, would say that tranquillity is overrated as the goal of life.

For seventeenth-century astronomers, the Epicurean doctrine of multiple worlds separated by void space was seen to fit with the new Copernican system in which every star was a sun, and the universe was a vast place with no centre.

If you live in an acquisitive society you are likely to be acquisitive, but it isn't deeply rooted in human nature, except in the sense that it's deeply rooted to be psychologically receptive to your peers and to advertising.

Epicurus thought that friendship and conviviality, which require present attention rather than being in an alcoholic stupor, as well as trying to understand and explain things, were the greatest sources of satisfaction in life, so there go most drugs.

Order can arise from chaos without anyone or anything directing the process when unstable combinations of atoms perish and others persist. In the 17th century, Descartes applied this insight to cosmology, and long before Darwin presented his more rigorous ideas about variation and selection, people began to speculate more openly about the origins of life and the species in Epicurean terms.

Some critics thought the ontology and theory of qualities absurd. No one had ever seen these little atoms, and furthermore, how could their mere arrangement produce a noisy, colourful, world in which day followed night and animals generated their own kind? Instead of a world created, cared, for and supervised by supernatural persons, the Epicureans appeared to the theologians to be assigning everything to chance. The latter were appalled by Lucretius's view of religion as cruel and oppressive and by the Epicurean insistence that death is the end of all experience.