(Daily Mail) The idea of indestructible killer robots may sound like something straight out of the Terminator movie.
But they could soon become a reality, as scientists have just witnessed metal healing itself for the first time, without any human intervention.
A US-based study has overturned everything we thought we knew about metals by revealing that cracks from wear and tear can actually mend themselves under certain conditions.
It's a discovery that has the potential to revolutionise engineering, with the prospect of self-healing engines, planes and even robots now on the horizon.
'This was absolutely stunning to watch first-hand,' said Brad Boyce, a scientist at Sandia National Laboratories who led the study with Texas A&M University.
'What we have confirmed is that metals have their own intrinsic, natural ability to heal themselves, at least in the case of fatigue damage at the nanoscale.'
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