| 1. | :Light is so fast because it has no rest mass.
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| 2. | Neutrinos oscillate in three flavors and all neutrinos have their rest mass.
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| 3. | For example, an electron and a positron each have rest mass.
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| 4. | Photons have zero rest mass, but nonzero relativistic mass.
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| 5. | :Kinetic energy is the difference between rest mass and relativistic mass.
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| 6. | For objects with a rest mass this means they are slowing down.
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| 7. | What we normally think of as mass is rest mass.
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| 8. | What is the status of the possibility that photons have nonzero rest mass?
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| 9. | Hence zero rest mass and zero lenght for photons.
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| 10. | For light with no rest mass, this means the frequency goes down.
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