Democracy requires citizens to see things from one another's point of view, but instead were more and more enclosed in our own bubbles. Democracy requires a reliance on shared facts; instead were being offered parallel but separate universes.

It is easy and dismally enervating to think of opposition as merely perverse or actually evil-far more invigorating to see it as essential for honing the mind and as a positive good in itself. For the day that moral issues cease to be fought over is the day the word 'human' disappears from the race.

My final remark to young women and men going into experimental science is that they should pay little attention to the speculative physics ideas of my generation. After all, if my generation has any really good speculative ideas, we will be carrying these ideas out ourselves.