Wha do you believe the nature of free will is?

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I mean..biologically, mystically..whatever. How does it work? How does a creature contain or exist without it? I ask 'cause scientists have discovered evidence that flies have free will: http://news.sky.com/skynews/article/0,,91059-1265906,00.html They say that this will lead them to discerning the nature of free will..and could help scientists develope free-thinking robots.