If art, all art, is concerned with truth, then a society in denial will not find much in use for it. - Jeanette Winterson

In a vacuum all photons travel at the same speed. They slow down when travelling through air or water or glass. Photons of different energies are slowed down at different rates. If Tolstoy had known this, would he have recognised the terrible untruth at the beginning of Anna Karenina? 'All happy families are alike; every unhappy family is unhappy in its own particular way.' In fact it's the other way around. Happiness is a specific. Misery is a generalisation. People usually know exactly why they are happy. They very rarely know why they are miserable.

Where did love begin? What human being looked at another and saw in their face the forests and the sea? Was there a day, exhausted and weary, dragging home food, arms cut and scarred, that you saw yellow flowers and, not knowing what you did, picked them because I love you?

The curious are always in some danger.