“In office buildings and retail premises in which entry is through double doors and one of those doors is locked for no reason, the door must bear a large sign saying: “This Door Is Locked for No Reason.”

“I love everything about motels. I can't help myself. I still get excited every time I slip a key into a motel room door and fling it open.”

“We are so used to the notion of our own inevitability as life’s dominant species that it is hard to grasp that we are here only because of timely extraterrestrial bangs and other random flukes. The one thing we have in common with all other living things is that for nearly four billion years our ancestors have managed to slip through a series of closing doors every time we needed them to.”

“The pebbled glass door panel is lettered in flaked black paint: "Philip Marlowe...Investigations." It is a reasonably shabby door at the end of a reasonably shabby corridor in the sort of building that was new about the year the all-tile bathroom became the basis of civilization. The door is locked, but next to it is another door with same legend which is not locked. Come on in--there's nobody here but me an a big bluebottle fly. But not if you're from Manhattan, Kansas.”

“Cavendish is a book in himself. Born into a life of sumptuous privilege- his grandfathers were dukes, respectively, of Devonshire and Kent- he was the most gifted English scientist of his age, but also the strangest. He suffered, in the words of one of his few biographers, from shyness to a "degree bordering on disease." Any human contact was for him a source of the deepest discomfort. Once he opened his door to find an Austrian admirer, freshly arrived from Vienna, on the front step. Excitedly the Austrian began to babble out praise. For a few moments Cavendish received the compliments as if they were blows from a blunt object and then, unable to take any more, fled down the path and out the gate, leaving the front door wide open. It was some hours before he could be coaxed back to the property. Even his housekeeper communicated with him by letter.Although he did sometimes venture into society- he was particularly devoted to the weekly scientific soirees of the great naturalist Sir Joseph Banks- it was always made clear to the other guests that Cavendish was on no account to be approached or even looked at. Those who sought his views were advised to wander into his vicinity as if by accident and to "talk as it were into vacancy." If their remarks were scientifically worthy they might receive a mumbled reply, but more often than not they would hear a peeved squeak (his voice appears to have been high pitched) and turn to find an actual vacancy and the sight of Cavendish fleeing for a more peaceful corner.”

“Bipedalism is a demanding and risky strategy. It means refashioning the pelvis into a full load-bearing instrument. To preserve the required strength, the birth canal in the female must be comparatively narrow. This has two very significant immediate consequences and one longer-term one. First, it means a lot of pain for any birthing mother and greatly increased danger of fatality to mother and baby both. Moreover, to get the baby's head through such a tight space it must be born while it's brain is still small - and while the baby, therefore, is still helpless. This means long-term infant care, which in turn implies solid male-female bonding.”

“Why did *I* lock the door? Why did YOU lock the door? Someone locked the door...”