This state-of-the art, interactive exhibit hall (popularly known as The Tech) is designed to encourage the spirit of innovative curiosity, characteristic of the original techno-tinkerers of Silicon Valley. On the Upper Level, exhibits in Life Tech invite adults and children to test their reactions on a virtual Olympic bobsled ride; design a human-powered bicycle, boat or airplane; and tour a virtual operating room that depends on non-invasive technologies for diagnosis and treatment of the human body. Innovation provides a glimpse of robotics and computer-generated design. Changing exhibits in The Spirit of American Innovation portray state-of-the-art technology now under development. In Exploration, budding explorers may pilot a robotic submarine, test-drive a remote-control planetary rover, design an earthquake-proof building, or test hand-eye coordination with a laser affixed to a space-age chair. NetPl@net invites you to roll up your sleeves for a virtual arm wrestle, create characters and chat online in a 3D world, and publish your own Web page. In Idea House you can use technology to design a snack contraption for a person with a broken leg and the munchies. Adjacent to the ground-floor street entrance, the 295-seat Hackworth IMAX Dome Theater screens documentary films on a hemispherical screen that covers 80 percent of the dome, engulfing the audience with images and sound.