About This Lesson
A look at what inventors and inventions are; how inventors are scientists (and the processes they go through as they invent) and an in depth look at the invention of the ball point pen to illustrate.
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A look at what inventors and inventions are; how inventors are scientists (and the processes they go through as they invent) and an in depth look at the invention of the ball point pen to illustrate.
Not sure what format this lesson is in, but the lesson will not open due to the format.