complicate the earlier waves--and no amount of paddling the surface of a roiled pond is going to
restore it to a mirror surface.
The only solution, Nexx Central realized, was to remove the first causes of the original
dislocations. In the beginning, of course, the disturbances set up by Old Era travelers were mere
random violations of the fabric of time, created as casually and as carelessly as footprints in
the jungle. Later, when it had dawned on them that every movement of a grain of sand had
repercussions that went spreading down the ages, they had become careful. Rules had been made, and
even enforced from time to time. When the first absolute prohibition of time meddling came along,
it was already far too late. Subsequent eras faced the fact that picnics in the Paleozoic might be
fun, but exacted a heavy price in the form of temporal discontinuities, aborted entropy lines, and
probability anomalies. Of course, Nexx, arising as it did from this adulterated past, owed its
existence to it; careful tailoring was required to undo just enough damage to restore vitality to
selected lines while not eliminating the eliminator. Superior minds had to be selected and trained
to handle the task.
Thus, my job as a Nexx field agent: to cancel out the efforts of all of them--good and
bad, constructive or destructive; to allow the wounds in time to heal, for the great stem of life
to grow strong again.
It was a worthy profession, worth all it cost. Or so the rule book said.
I started off along the shore, keeping to the damp sand where the going was easier,
skirting the small tidal pools and the curving arcs of sea scum left by the retreating tide.
The sea in this era--some sixty-five million years B.C.--was South-Sea-island blue,
stretching wide and placid to the horizon. There were no sails, no smudges of smoke, no beer cans
washing in the tide. But the long swells coming in off the Eastern Ocean--which would one day
become the Atlantic--crashed on the white sand with the same familiar _carrump--whoosh!_ that I
had known in a dozen eras. It was a comforting sound. It said that after all, the doings of the
little creatures that scuttled on her shores were nothing much in the life of Mother Ocean, age
five billion and not yet in her prime.
The station was a quarter of a mile along the beach, just beyond the low headland that
jutted out into the surf; a small, low, gray-white structure perched on the sand above the high-
tide line, surrounded by tree ferns and club mosses, both for decoration and to render the
installation as inconspicuous as possible, on the theory that if the wildlife were either
attracted or repelled by a strange element in their habitat, uncharted U-lines might be introduced
into the probability matrix that would render a thousand years of painstaking--and painful--
temporal mapping invalid.
In a few minutes I'd be making my report to Nel Jard, the Chief Timecaster. He'd listen,
ask a few questions, punch his notes into the Masterplot and pour me a drink. Then a quick and
efficient session under the memory-editor to erase any potentially disquieting recollections
arising from my tour of duty in the Twentieth Century--such as Lisa. After that, a few days of
lounging around the station with other between-jobs personnel, until a new assignment came up--
having no visible connection with the last one. I'd never learn just why the Karg had been placed
where it was, what sort of deal it had made with the Third Era Enforcer--the man in black--what
part the whole thing played in the larger pattern of the Nexx grand strategy.
And probably that was just as well. The panorama of time was too broad, the warp and the
woof of its weaving too complex for any one brain to comprehend. Better to leave the mind free to
focus on the details of the situation at hand, rather than diffuse it along the thousand dead-end
trails that were the life of a Timecast Agent. _But Lisa, Lisa_ . . .
I put the thought of her out of my mind--or tried to--and concentrated on immediate
physical sensations: the hot, heavy air, the buzzing insects, the sand that slipped under my feet,
the sweat trickling down my temples and between my shoulder blades. Not that those things were any
fun in themselves. But in a few minutes there'd be cool clean air and soft music, a stimbath, a
hot meal, a nap on a real air couch . . .
A couple of off-duty agents, bright-eyed, efficient, came out to meet me as I came across
the slope of sand to the edge of the lawn, through the open gate and in under the shade of the
protopalms. They were strangers to me, but they greeted me in the casually friendly way that you
develop in a lifetime of casual friendships. They asked me the routine questions about whether I
had had a rough one, and I gave them the routine answers.
Inside the station the air was just as cool and clean as I'd remembered--and as sterile.
The stimbath was nice--but I kept thinking of the ironstained bathtub back home. The meal
afterward was a gourmet's delight: reptile steak smothered in giant mushrooms and garnished with
prawns, a salad of club-moss hearts, a hot-and-cold dessert made by a barrier-layer technique that
wouldn't be perfected for another sixty-five million years but didn't compare with Lisa's lemon
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