Physics
A mirage occurs because of

Diffraction of light
Interference of light
Total internal reflection by layers of air
Reflection by hot ground

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Physics
Should cars have bumpers that collapse under impact?

Yes, since the offending car should get damaged and pay for the mistake
No, since it would be very expensive to get the car repaired
Yes, since they help to absorb the impact of a collision and keep the occupants safe
No, since the colliding car would then ram into the occupants and kill them

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