This escalator is directed toward the fourth floor, with stairs sandwiched in between ... Five and contractor Phoenix Diversified Group the same year, saying it was owed $149,000.

However, the elevator can only service one floor at a time, and everyone else has to wait. Plus, a broken elevator is useless, while a broken escalator ... them are on the same motor.

A version of this puzzle originally appeared in the May 1959 issue of Scientific American. We’d love to hear from you! E-mail ...

Her climb came the same morning Miami-Dade County Mayor ... An airport employee walks down the stairs next to a broken escalator on the second floor at the Miami International Airport on Thursday ...