The Arizona Science Center features hundreds of hands-on exhibits. Pedal a bicycle across a cable suspended 15 feet high, learning why the laws of physics won’t allow you fall. More highlights: lie on a bed of nails, climb a rock wall, learn about digital technology and view undersea wonders on a five-story tall IMAX screen or trace the constellations in the Arizona sky at the high-tech planetarium. During “Starry Storytime,” young kids hear legends about the stars and planets.