What is the sound of one piston slapping?
What is the sound of one piston slapping?

where the OPPOsaurus children shall crush the competition.... My daughter’s are having a science fair. The first thing I thought was a volcano with real fire but thats kinda lame. Whats a good 2nd grader science project. But wait, there is more..... I need two cuz I have twins. OR possibly one that they could each have a part.

Illustration for article titled This is a non-competitive opportunity


  • Nothing that causes harm or stress to humans or animals
  • No live vertebrate animals may be brought to the fair
  • No bacterial cultures
  • No controlled substances
  • No dangerous or combustible chemicals
  • No open flames
  • No food or snacks allowed due to allergy concerns
  • At least one adult must accompany the student during the fair

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