In ages past, various attempts were made to find some constant in nature on which measures could be based. Some of these attempts were ludicrous, and all of them failures, until the vibrations of a pendulum connected length and space with time. The problem was then more easy. The changes of seasons and the movement of heavenly bodies had established measures of time, so that days, hours, and minutes became constants, proved and maintained by the unerring laws of nature.And then, as Gregg took a leisurely stride towards the door, as though to investigate matters on his own, the Doctor caught hold of his sleeve. "Don't do that. Listen, first, to what I have to tell you. I rather fancy it will take the edge off your curiosity."Regles que ha de complir la contrasenya:
Bruce's heart beat a little faster as he heard a scuffling on the step and the muffled rattle of a latchkey in the door. There was a breath of welcome fresh air in the stuffy place, the impact of two bodies, and Lawrence rushed upon the newcomer. There was a muttered curse and a fall.