Exactly how many triangles can you count in this fun triangle puzzle?

As electric-white movie star smiles become increasingly popular, more and more people seek to correct their dental imperfections. Black triangles between your teeth, called open gingival embrasures, ...

Named for Plato, who theorized that the classical elements were made of these regular polyhedrons, three of the Platonic solids are composed of equilateral triangles: the tetrahedron, octahedron, and ...

If you're feeling rather bleary eyed from a busy weekend, waking your brain up with a tricky optical illusion might just be the ticket. Brain teasers challenge your sense of perception and force you ...

What does connect-the-dots have to do with watching a Pixar film? More than you might think. A connect-the-dots page starts with nothing but some labelled points. As each dot is joined to the next, ...