Uploaded October 2013 | Updated September 2026, 10 minutes ago

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Under certain conditions, putting a cracked piece of metal under tension— that is, exerting a force that would be expected to pull it apart— has the reverse effect, causing the crack to close and its edges to fuse together.

Source: MIT

Read more: laboratoryequipment.com/videos/2013/10/cracked-metal-can-heal-itself