BEHIND THE DENTIST’S DRILLOnly in the last few decades has filling a cavity become routine. What came before was centuries of painful experimentation. by Malvin E. Ring
SEAWAY TO NOWHEREIt took more than four centuries for the St. Lawrence Seaway to be built —and less than two decades for it to become obsolete, the victim of a changing industry and its own design shortcomings. by Daniel J. McConville
THE OLD HIGH-TECH HOTELBesides being showplaces of opulence and splendor, American hotels have long been pacesetters for the introduction of new technology, from indoor plumbing to elevators to air conditioning. by Molly W. Berger
MY FATHER THE INVENTORAs inventor, businessman, and father, Tad Sendzimir was a dominating presence, alternately inspiring and annoying. His daughter explains the complexities and contradictions of a brilliant innovator. by Vanda Sendzimir
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