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Science Clips Investigates Reversible and Irreversible Change Clips

  1. Preventing household fires - flame retardants

    Duration: 04:33

  2. Joseph Priestley 鈥� the discovery of gases (signed)

    Duration: 03:33

  3. Joseph Priestley 鈥� the discovery of gases

    Duration: 03:33

  4. Preventing household fires - flame retardants (signed)

    Duration: 04:33