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Induction hardening is a type of surface hardening in which a metal part is induction-heated and then quenched [read more: ]
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Induction hardening is a type of surface hardening in which a metal part is induction-heated and then quenched

[read more: ]

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A growing log.
By stacking paper like a honeycomb, hardening it with glue, and then carving the shape, it expands and contracts like an accordion.
A work by Chinese artist Li Hongbo.

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Can you 'milk' a spider?

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