This article (the first of two) contains ideas for investigations.
Space-time, the curvature of space and topology are introduced with
some fascinating problems to explore.
This is the second of two articles and discusses problems relating
to the curvature of space, shortest distances on surfaces,
triangulations of surfaces and representation by graphs.
A personal investigation of Conway's Rational Tangles. What were
the interesting questions that needed to be asked, and where did
Published February 2011.