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Dan Burns explains his space-time warping demo at a PTSOS workshop at Los Gatos High School, on March 10, 2012. Thanks to Shannon Range from the Gravity Probe B program for creating the original demonstration which he shared with Dan in 2004.
Information on how to make your own Spacetime Simulator can be found here:
http://prettygoodphysics.wikispaces.c... Gravity - Official Main Trailer [2K HD] - YouTube, Gravity Visualized - YouTube, Gravity Switch, Gravity - Wikipedia, Speed of gravity - Wikipedia, Sara Bareilles Lyrics - Gravity, Global Playground GRAVITY, Gravity (2013) - IMD, iChun's blog » Gravity Gun, Ironman Gravity 4000 Inversion Table - Amazon.co,