This is something physicists tell us is possible.
Finely polished steel with perfectly squared ends can be matched end to end and
struck with a hammer so that the molecules are "Jarred" across the tiny gap
between the highly polished ends,- uniting the two pieces into a single whole.
Speaking of his strange powers, this blacksmith
took a metal rod, and pounded it deep into a large rock with a single blow of
his hammer. He said that whoever could remove the rod with his bare hands,
had greater powers than he did.
As his fame spread, so did his popularity, and
he eventually married. To gain his powers though, his part of the pact
with the devil was that he would give the devil his first born son.