The world is on fire. The flames are hard to see, because we hide them so well. But you can hear them — in the whine of jet engines as planes streak across the sky, in the rumble of power plants as ...

Describing the motion of three or more bodies under the influence of gravity is one of the toughest problems in astronomy. The report of solutions to a large subclass of the four-body problem is truly ...

In his popular book on creative problem solving, Conceptual Blockbusting: A Guide to Better Ideas, James Adams (2001) follows the nine-dot problem through several increasing challenges. Referring to ...