Dirac's Plate Trick, the Hairy Ball Theorem and more: Research probes physics of irregular objects on inclined planes
How gravity causes a perfectly spherical ball to roll down an inclined plane is part of the elementary school physics canon.
The New York Times3d
The Learning Network
Advice from an English teacher in Massachusetts for guiding teenagers to think critically but not cynically about the information they consume. By David Nurenberg This collection of interactive ...