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
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

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Physics
The bats can fly in the dark because

They have weak legs and are likely to be attacked by predators
They generate flashes of light
They generate ultrasonic sound waves
They can see the objects in darkness

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