In spite of Ling's misgivings, you decide that you
really must check ou the Electronics Department
of the lab. Its door swings open automatically as
you approach.  Inside are various decives that you
don't immediately understand.  Some appear to
be computers; some appear to be just jumbles
of wires, coils, and transistors.
  While Ling takes pictures of everything in sight
you notice a device even stranger looking than all
the rest: two metalic hoops, one inside the other.
The outer hoop is a bronze-gold color and the
inner one is silvery. A harness very like a para-
chute's harness is suspended from the hoops.
There's a kind of plastic backpack at the rear, and
in the front there's a control module with two 
joysticks.
  You try it on and press the left joystick forward.
There's a crackling noise, like static electricity, and
electric flashes whirl around the hoops.  The
flashes from the bronze-gold hoop go clockwise,
and the ones from the silvery hoop go coun-
terclockwise.
  Then you rise straight up in the air!
  Just as you are about to smash against the ceil-
ing you pull back on the left joystick, and you start
downward. You push it to the center and you float.
After a little experimenting, you learn that one
joystick controls direction and the other controls
speed.
  "Ling," you call out, I think I've found some-
thing interesting!"

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