Physics
The sky appears blue because of

Emision of blue wavelength by the sun
Atmospheric water vapour
Scattering of light
Reflection on sea water

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Physics
The wall of a dam is broader at the base

To withstand pressure that is increased with atmospheric pressure
Because streamlining is required
To withstand pressure that increases with depth
To withstand pressure that increases in a horizontal plane

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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
No, since it would be very expensive to get the car repaired
Yes, since the offending car should get damaged and pay for the mistake

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