Word: pile
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...yearbook staff must pile up 500 subscriptions before plans for the Book can be continued. Due to the $390 debt incurred by last year's yearbook, "the Forty and Nine," the Dean's Office will not approve yearbook plans until a sufficient financial backlog is assured...
From early morning until midnight the pile driver banged, ringing in the heads of downtown office workers, rattling the windows in Kaufmann's department store, keeping guests awake in the William Penn Hotel, echoing through the narrow canyons of Pittsburgh's Golden Triangle. Blasting intermittently shook the slab-side Mellon National Bank and Trust Co. which had hardly trembled through the depression...
...Triangle's point. It was a vision of a city cleared of drab relics of half a century, cured of its traffic congestions, freed of the pollution of its rivers and the poison of its soot-heavy air, a city better housed. The hammering of the pile driver was the nervous pulse of a run-down old Pittsburgh acquiring a new life...
...Smyth Report told them (as their own scientists could have told them anyway) that there are two roads to the release of explosive atomic energy. One is separating explosive uranium 235 from natural uranium. The other is transmuting uranium into explosive plutonium in a chain-reacting pile. The U.S. has used and is still using both methods successfully...
Plutonium is trickier. It is made in a pile consisting of natural uranium (mostly U-238) rods imbedded in super-pure graphite. When everything is just right, a chain reaction starts. Plutonium can be separated from _ uranium by comparatively simple chemical refining. But the piles themselves are not simple. If they don't work just right, they don't work...