The day of the week on which the tour took place was known to all workers. All devices in its path ought to have been carefully neutralized or locked… - Isaac Asimov

Pyscho-history dealt not with man, but with man-masses. It was the science of mobs; mobs in their billions. It could forecast reactions to stimuli with something of the accuracy that a lesser science could bring to the forecast of a rebound of a billiard ball. The reaction of one man could be forecast by no known mathematics; the reaction of a billion is something else again.

Su Realidad seguía la línea de la máxima probabilidad. Si aquella máxima probabilidad comprendía una pandemia, o diez Siglos de economía esclavista, o la ruina de la tecnología hasta..., vamos a ver, algo realmente pernicioso..., incluso hasta la guerra atómica si eso hubiera sido posible en aquel tiempo, ¡por Cronos!, aquello sucedía.

It wasn't to be endured! For half an hour, the Captain shot off salvo after salvo of the very worst sort of profanity. He started with the sun and ran down the list of planets, satellites, asteroids, comets, to the very meteors themselves. He was starting on the nearer fixed stars, when he collapsed from sheer nervous exhaustion. He was so excited that he never thought to ask us what we were doing in the storeroom in the first place, and for that Whitefield and I were duly grateful.

But Captain Bartlett is no fool. Having purged his system of its nervous tension, he saw clearly that that which cannot be cured must be endured.