What do we tell him?
Our swing-set is near a few fruit trees. Emmett has noticed that while he swings, the sun seems to move back and forth behind the trees, too. He wants to know how the sun knows he's swinging.
Murderous Maths
Emmett has been reading and re-reading and re-reading all of the Murderous Maths books, and enjoying them immensely. He told me that you can't have a right triangle with an obtuse angle in it. I, being a geek and kind of mean, said, "Well, you can't unless the triangle is on the surface of a sphere." We've talked about triangles on spheres before, but I was a bit surprised when he confidently responded, "Correct!" His dad, not to be outdone, wondered about a triangle on a hyperbolic plane (shaped like a pringle), but shortly concluded that it could only be done in spaces with positive curvature. Emmett has it coming at him from all sides...
Comments