She dreams of artificial gravity. And that sounds weird, but not when you talk for any length of time with Marie Shields, who is an artist, a wild thinker and an entrepreneur. Her first name is pronounced like "MAHR-ee," a change she made a couple of years ago to distinguish herself from the girls with similar sounding names. Of course she did. She is 17, and already has adopted the universe as her palate. She desperately wants humans to explore Mars and wants to help that effort by figuring out how to create artificial gravity in outer space. She thinks humans taking long-term voyages to Mars would need to make their own gravity to survive.