Physics
The mercury and sodium street lamps light up because of :

Electron emission
Electron absorption
Atomic absorption
Atomic emission

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Physics
Should cars have bumpers that collapse under impact?

No, since the colliding car would then ram into the occupants and kill them
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

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