WaterG
WaterG WaterG
  • 13-12-2016
  • Chemistry
contestada

What are some ideas for a compound machine for my middle school invention science project that can be useful in people's daily lives? I need a explanation of why it's important.

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huntyella
huntyella huntyella
  • 14-12-2016
A toothbrush that has toothpaste in the middle so it comes preloaded. That way it is cleaner and uses more product than normal
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