Can a Circle Be a Straight Line?

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General Relativity! Spacetime! And... Curved Lines? On this week's episode of Spacetime, Gabe talks about what it actually means for a line to be straight so we can better understand what we mean by the idea of "curved Spacetime". This is Part One of our series on General relativity, so be sure to check it out!

Links to Annotated Previous PBS Space Time Episodes:
"Is Gravity an Illusion?" https://www.youtube.com/watch?v=NblR01hHK6U
"Are Space and Time an Illusion?" https://www.youtube.com/watch?v=YycAzdtUIko

Extra Credit:
Visualizing parallel transport and geodesics on a sphere:
http://www.applet-magic.com/paralleltransport.htm
http://www.smith.edu/physics/felder/curvedland/tutlines.html

More mathematical PDF about parallel transport and curvature:
http://www.physics.ucc.ie/apeer/PY4112/Curvature.pdf

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