A team of researchers has successfully built a strange four-faced pyramid named Bille that always lands on the same face—no ...

“Bille” is the first-ever monostable tetrahedron, or a pyramid-like shape with four triangular faces that has one stable ...

There are a lot of people on the planet, with more added every day. It took 200,000 years to get to one billion people, then only 200 years to get to 7 billion. We added one billion people in just ...