On the platform connecting the Viking to the aircraft carrier, Bi Fang scooped up a bowl of seawater with the wooden bowl he had just emptied of water and tore off a palm leaf that had been wrapping a shark meat patty.
He waited a moment until the ripples in the bowl had subsided.
Bi Fang took a small piece of paperclip, rubbed it vigorously against his hair, and after a while, he placed it on the palm leaf, gently setting it into the bowl.
Seconds later, everyone could clearly see the leaf in the water start to turn!
After swaying side to side for a while, it eventually stopped in a certain direction.
[Whoa, that's epic, it's a compass]
[Magnetized by rubbing on the scalp, then floating it on water, it points to the Earth's magnetic field]
[Amazing, it sounds simple, but it's not easy to think of]
The whole process wasn't complicated, and the audience understood it at a glance.