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Adding to number 16: this discontinuity exists in Newtonian physics
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#:For a particle with mass, this means that momentum of zero gives a speed of zero, and, as the momentum approaches infinity, the speed approaches c.
 
#:For a particle with mass, this means that momentum of zero gives a speed of zero, and, as the momentum approaches infinity, the speed approaches c.
 
#:For a massless particle, the speed is always c.
 
#:For a massless particle, the speed is always c.
 +
#:Furthermore, this discontinuity in momentum does exist in Newtonian physics with the formula <math>p = mv</math>.  If we let v approach c while m approaches 0 we get <math>p=0</math>, while light has a nonzero momentum. 
 
#''observations don't match predictions'' and cosmic causality.
 
#''observations don't match predictions'' and cosmic causality.
 
#:The fact that "observations don't match predictions" has shown up many times in the history of science.  That is, the accepted wisdom of the day was found to be false, leading to improved theories:
 
#:The fact that "observations don't match predictions" has shown up many times in the history of science.  That is, the accepted wisdom of the day was found to be false, leading to improved theories:
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