Wormholes are solutions to the Einstein field equations for gravity that act as "tunnels," connecting points in space-time in such a way that the trip between the points through the wormhole could take much less time than the trip through normal space.
The first wormhole-like solutions were found by studying the mathematical solution for black holes. There it was found that the solution lent itself to an extension whose geometric interpretation was that of two copies of the black hole geometry connected by a "throat" (known as an Einstein-Rosen bridge). The throat is a dynamical object attached to the two holes that pinches off extremely quickly into a narrow link between them.
This analysis forces one to consider situations...where there is a net flux of lines of force through what topologists would call a handle of the multiply-connected space and what physicists might perhaps be excused for more vividly terming a ‘wormhole’.
– John Wheeler in Annals of Physics
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Friday, October 28, 2011
Alan Kay: A powerful idea about teaching ideas
With all the intensity and brilliance he is known for, Alan Kay gives TEDsters a lesson in lessons. Kay has spent years envisioning better techniques for teaching kids. In this talk, after reminding us that "the world is not what it seems," he shows us how good programming can sharpen our picture. His unique software lets children learn by doing, but also learn by computing and by creating lessons themselves.
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