Physics
Stars in the sky appear to twinkle due to

A surface tension phenomenon
A series of reflections
Multiple diminishing brightness
A series of refractions

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Physics
Absolute Zero is defined as

At which water boils at 298K
The temperature at which all molecular motion ceases
At which liquid Helium boils
At which the volume becomes zero

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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 the colliding car would then ram into the occupants and kill them
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

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