The researchers used a new method called the film inflation method to study how the thickness of a liquid affects its ability to form metallic glasses. They found that the fragility of the liquid, which is how easily it changes from a liquid to a solid, varies a lot in different metal mixtures. Surprisingly, having a low fragility doesn't always mean the liquid is good at forming metallic glasses. They also discovered that how complex the liquid is when it starts to turn into a solid can play a big role in how well it forms metallic glasses.