The art of mechanical analog computing reached its zenith with the differential analyzer, built by H. L. Hazen and Vannevar Bush at MIT starting in 1927. This built on the mechanical integrators of James Thomson and the torque amplifiers invented by H. W. Nieman. A dozen of these devices were built before their obsolescence became obvious.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): The differential analyzer by H.L. Hazen and Vannevar Bush was first being built in what year?
Ah, so.. 1927

From earliest days, Virginia, and Richmond in particular, have welcomed live theatrical performances. From Lewis Hallam's early productions of Shakespeare in Williamsburg, the focus shifted to Richmond's antebellum prominence as a main colonial and early 19th century performance venue for such celebrated American and English actors as William Macready, Edwin Forrest, and the Booth family. In the 20th century, Richmonders' love of theater continued with many amateur troupes and regular touring professional productions. In the 1960s a small renaissance or golden age accompanied the growth of professional dinner theaters and the fostering of theater by the Virginia Museum, reaching a peak in the 1970s with the establishment of a resident Equity company at the Virginia Museum Theater (now the Leslie Cheek) and the birth of Theatre IV, a company that continues to this day.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What family of actors notably performed in 19th century Richmond?
Ah, so.. Booth

Many electronic dance music and hip hop releases today are still preferred on vinyl; however, digital copies are still widely available. This is because for disc jockeys ("DJs"), vinyl has an advantage over the CD: direct manipulation of the medium. DJ techniques such as slip-cueing, beatmatching, and scratching originated on turntables. With CDs or compact audio cassettes one normally has only indirect manipulation options, e.g., the play, stop, and pause buttons. With a record one can place the stylus a few grooves farther in or out, accelerate or decelerate the turntable, or even reverse its direction, provided the stylus, record player, and record itself are built to withstand it. However, many CDJ and DJ advances, such as DJ software and time-encoded vinyl, now have these capabilities and more.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): In what techniques would a DJ require a vinyl record?
Ah, so..
slip-cueing, beatmatching, and scratching