Here's The Cool Thing That Happens When You Pour Molten Aluminium Inside Polymer Water Balls

Here's the cool thing that happens when you pour molten aluminium inside polymer water balls

The Backyard Scientist filled a tank to the brim with water balls, which are little polymer beads that expand to slimy squishy balls when soaked in water, and then poured in molten aluminium to create some wild designs. It's cool because with all the different ways the molten aluminium can move within a vat filled with balls, each pour results in a totally different design.