A tetrahedron is the simplest Platonic solid. Mathematicians have now made one that’s stable only on one side, confirming a decades-old conjecture. In 360 BCE, Plato envisioned the cosmos as an ...
A toy called a tumbler is a toy with an egg-shaped hemisphere at the bottom, which stands up on its own even if it is tilted thanks to the weight at the bottom. A mathematician has not only ...
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