Space-Time the easy way
You do not need fancy electronic tools to visualise space-time data: xkcd shows us how to do it using pen and paper, in a useful and useable way. For the legible version see http://xkcd.com/657/large/
...and funny: did you see the movie "12 angry men"...? Possibly many of you (the older ones ;-) Did you see "Primer"...? Not many of you I'd guess, but do try to get hold of it (or just Wikipedia it to understand the graph).