This Weird Pyramid Always Lands on the Same Face, Confirming 40-Year-Old Theory
“Bille” is the first-ever monostable tetrahedron, or a pyramid-like shape with four triangular faces that has one stable resting position. What this means is that Bille, no matter how you throw it and how it lands, will flip back on exactly the same side every single time. In a recent preprint submitted to arXiv, mathematicians revealed the first physical model of Bille, closing a decades-old theory proposed by the renowned British mathematician John Conway. Made of lightweight carbon fiber and