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Investigation 01The World of Physical ScienceInvestigation 02The Properties of MatterInvestigation 03States of MatterInvestigation 04Elements, Compounds, and MixturesInvestigation 05Matter in MotionInvestigation 06Forces and MotionInvestigation 07Forces in FluidsInvestigation 08Work and MachinesInvestigation 09Energy and Energy ResourcesInvestigation 10Heat and Heat TechnologyInvestigation 11Introduction to AtomsInvestigation 12The Periodic TableInvestigation 13Chemical BondingInvestigation 14Chemical ReactionsInvestigation 15Chemical CompoundsInvestigation 16Atomic EnergyInvestigation 17Introduction to ElectricityInvestigation 18ElectromagnetismInvestigation 19Electronic TechnologyInvestigation 20The Energy of WavesInvestigation 21The Nature of SoundInvestigation 22The Nature of LightInvestigation 23Light and Our World