At Larry Shaw’s request, Blish expanded “Beep” into the short novel The Quincunx of Time, and both these stories share a background wherein the work of Dolph Haertel (the next Einstein) provides an FTL-drive (the Haertel Overdrive, later called the Imaginary Drive), an antigravity device (the spindizzy), and an instantaneous communicator (the Dirac Radio). I read many of these in the early ’70s, but can’t find my notes and don’t remember any other time travel beyond that one communiqué that Lje overheard. Still, I’ll list everything in The Haertel Scholium and reread them some day!
Kirk could not reply. Spock took his arm gently. “He knows,” he said. “Soon you will know, too. And what was. . . now is again.”