More than a century after Xu Lei had presented the Steel Refining Technique, people in the Great Shang were now producing iron screws.
He had actually come up with them himself over the last decade, simply out of boredom.
"Ah?"
The Crown Princess Consort was also astonished. "Are they really that impressive?"
She inspected them and, naturally, found nothing out of the ordinary.
"Watch closely!"
Without another word, Xu Lei grabbed a screw.
The trick was that the ring on his hand was magnetic.
He used the principle of magnetic repulsion to launch the screw away.
"Amazing!"
The Crown Princess Consort couldn't help but gasp. "How did you do that?"
Xu Lei had already put away the Iron Bowl and the copper plate from before.
But this bolt and screw showed no signs of being props.
Other than the bolt itself being magnetized.
"I will gift this to you, Patroness."
Xu Lei then added, "Inspect it as you wish."
His intention was to give her the magnetized bolt on purpose.
