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Lifelong Student-Centered Learning: A PME Paradigm for Honing Our Intellectual Edge

Lifelong Student-Centered Learning: A PME Paradigm for Honing Our Intellectual Edge
cimsec.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from cimsec.org Daily Mail and Mail on Sunday newspapers.

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Five SF Stories That Embrace the Scientifically Improbable Reactionless Drive

Tales of the Flying Mountains cover art by Bob Layzell (Tor Books, 1984)
Recently, physicists around the world were astounded to learn that painstaking testing of the visionary EmDrive revealed that the device produces no discernable thrust. By “astounded,” I mean “not astounded” and by “visionary,” I mean “almost certainly nonsensical from word one.” A cynical physicist might say the EmDrive produces thrust by violating conservation of momentum. This is unfair, because the EmDrive does not produce thrust at all.
One can understand the attraction of a reactionless drive. It comes down to the rocket equation, which presents steely-eyed rocket persons with a choice between annoyingly limited delta- ....

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