Physics
The safest hammers are those with heads that are

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

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Physics
Superconductors are those elements

Which conduct electricity only at super-high temperatures
Whose conductivity is intermediate between metals and insulators
Whose resistance falls almost to zero at very low temperatures
Which turn into insulators at very low temperatures

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