Physics
The safest hammers are those with heads that are

Alloy and drop-forged steel
Cast steel and chiseled
Chiseled and drop forged
Welded and alloyed

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Physics
Why does the sea appear blue in colour?

Scattering of the sunlight by water molecules
Reflection of the sun light from water surface
Interference of the sun light from water surface
Refraction of the sun light

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