Nitinol is the name of Nickel-Titanium alloy which has two interesting properties: shape memory and superelasticity. Otherwise said, if you have a Nitinol wire, heat it, give it a shape then every time you try to play with it upon heating it will get back to the shape you originally gave it.
You can see here the principle in physics that says that matter has memory. It is not about memory in human sense, but it has to do with the fact that the forces that govern the Universe shape everything around us. How can you otherwise explain that the Hydrogen atoms from water are positioned at 120 degrees of each other? Any other angle and water wouldn’t be the water we know.
Okay, too much talk so let’s see the demonstration made by Brusspup, a guy passionate about tech and everything interesting around us. Enjoy!