[caption id="attachment_49071" align="alignleft" width="157" caption="Researchers are working to achieve the "magic rate" of 30 frames per second. "][/caption]

In a development with important implications for future teaching and learning, scientists say they have taken a big step toward displaying live video in three dimensions—a technology that is much more advanced than 3-D movies and more like the "Star Wars" scene where a ghostly Princess Leia image pleads, "Help me, Obi-Wan Kenobi."

In that classic movie, the audience sees her back before a new camera...

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