Physics
Should cars have bumpers that collapse under impact?

Yes, since the offending car should get damaged and pay for the mistake
Yes, since they help to absorb the impact of a collision and keep the occupants safe
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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Physics
Superconductors are substances which

offer high resistance to the flow of current
offer no resistance to the flow of electricity
conduct electricity at high temperatures
conduct electricity at low temperature

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