There is evil! It's actual, like cement. - Philip K. Dick

Look in it,' he said, smiling slightly, as you do when you have given someone a present which you know will please him and he is unwrapping it before your eyes.
I opened it. In the folder I found four 8×10 glossy photos, obviously professionally done; they looked like the kind of stills that the publicity departments of movie studios put out.
The photos showed a Greek vase, on it a painting of a male figure who we recognized as Hermes.
Twined around the vase the double helix confronted us, done in red glaze against a black background. The DNA molecule. There could be no mistake.
'Twenty-three or -four hundred years ago,' Fat said. 'Not the picture but the krater, the pottery.'
'A pot,' I said.
'I saw it in a museum in Athens. It's authentic. Thats not a matter of my own opinion; I'm not qualified to judge such matters; it's authenticity has been established by the museum authorities. I talked with one of them. He hadn't realized what the design shows; he was very interested when I discussed it with him. This form of vase, the krater, was the shape later used as the baptismal font. That was one of the Greek words that came into my head in March 1974, the word “krater”. I heard it connected with another Greek word: “poros”. The words “poros krater” essentially mean “limestone font”. '
There could be no doubt; the design, predating Christianity, was Crick and Watson's double helix model at which they had arrived after so many wrong guesses, so much trial-and-error work. Here it was, faithfully reproduced.
'Well?' I said.
'The so-called intertwined snakes of the caduceus. Originally the caduceus, which is still the symbol of medicine was the staff of- not Hermes-but-' Fat paused, his eyes bright. 'Of Asklepios. It has a very specific meaning, besides that of wisdom, which the snakes allude to; it shows that the bearer is a sacred person and not to be molested...which is why Hermes the messenger of the gods, carried it.'
None of us said anything for a time.
Kevin started

He had wondered, as had most people at one time or another, precisely why an android bounced helplessly about when confronted by an empathy-measuring test. Empathy, evidently, existed only within the human community, whereas intelligence to some degree could be found throughout every phylum and order including the arachnida. For one thing, the empathic faculty probably required an unimpaired group instinct; a solitary organism, such as a spider, would have no use for it; in fact it would tend to abort a spider’s ability to survive. It would make him conscious of the desire to live on the part of his prey. Hence all predators, even highly developed mammals such as cats, would starve.

Empathy, he once had decided, must be limited to herbivores or anyhow omnivores who could depart from a meat diet. Because, ultimately, the empathic gift blurred the boundaries between hunter and victim, between the successful and the defeated. As in the fusion with Mercer, everyone ascended together or, when the cycle had come to an end, fell together into the trough of the tomb world. Oddly, it resembled a sort of biological insurance, but double-edged. As long as some creature experienced joy, then the condition for all other creatures included a fragment of joy. However, if any living being suffered, then for all the rest the shadow could not be entirely cast off. A herd animal such as man would acquire a higher survival factor through this; an owl or a cobra would be destroyed.

Evidently the humanoid robot constituted a solitary predator.

Ubik ... Safe when taken as directed.