Physics
A soap bubble shows colours when illuminated with white light. This is due to

Polarisation
Interference
Diffraction
Reflection

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Physics
Should cars have bumpers that collapse under impact?

Yes, since they help to absorb the impact of a collision and keep the occupants safe
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
No, since the colliding car would then ram into the occupants and kill them

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