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Do refrigerators use refrigerant? Why might a scientist reject a scientific theory? Explain why a false positive reaction result can be obtained with Koser's citrate medium? What do the wings of an airplane and the rotors of a helicopter have in common? How has liberty changed over time? Why is it important to learn conceptual movement patterns? How many mililiters in a litre? How is science different than other fields? What is used to demonstrate that the DNA molecule is a helix? How is the validity of a theory tasted? What is a samility? Is Na2C2O4 a base or acid? Why does tea in a cup become cold earlier as compared to teapot? What is the difference between CIE whiteness ans ganz griesser whiteness? How did the scientific discoveries of the 1700s apply to the understanding of the world? How are the five senses used to make observations? Science and technology inventions 1500-1700? What are indepenent and dependent variables? What was an oddity about tycho brahe? How much salt per gallon of sea water?