Starships! Warp drive! Teleportation! "Star Trek" has given real scientists more futuristic technologies to strive for than any other piece of science fiction, but there's one that perfectly embodies the anything-is-possible optimism of the franchise's technology. The holodeck, introduced in "Star Trek: The Next Generation," is the ultimate tool for experiencing any time and place with utter realism and immersion. The holodeck represents the movies and literature brought to life, and ever since "Star Trek" writers dreamed it up, we've been pining for virtual reality technology to catch up with the 24th century.