This short shows how two objects led to important discoveries. Children playing with a seesaw inspire French physician Rene Laennec to invent the stethoscope, and a pair of shoes made of caoutchouc lead Charles Goodyear to discover the process for vulcanizing rubber.
| Actor | Role |
|---|---|
| JJohn NesbittNarrator | Narrator |
 Arthur SpaceCharles Goodyear (uncredited) | Charles Goodyear (uncredited) |
| HHelen DicksonOne of Goodyear's Guests (uncredited) | One of Goodyear's Guests (uncredited) |
 Feodor Chaliapin Jr.Bit Part (uncredited) | Bit Part (uncredited) |
| SSheldon JettOne of Goodyear's Guests (uncredited) | One of Goodyear's Guests (uncredited) |