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The Rocket Boys run several tests in order to perfect their rocket design. They use the launch results as feedback to help them refine their design.
steve cantor over 1 year
For the engineering design process before they made and tested their catapults and trebuchets.
Anthony O'Toole about 1 year
For my 4th grade students as they made toothpick bridges and got frustrated that it wasn't working right away.