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+Challenge 1: "Write a script to find the intersection of two straight
+lines. The co-ordinates of the two lines should be provided as command
+line parameter. For example:
+
+The two ends of Line 1 are represented as co-ordinates (a,b) and (c,d).
+
+The two ends of Line 2 are represented as co-ordinates (p,q) and (r,s).
+
+The script should print the co-ordinates of point of intersection of
+the above two lines."
+
+My notes: Clearly defined, very easy if I can remember the formulae - let's
+have a go..  after doing it, I decided to run Gnuplot to display the results
+as it's an intensely graphical concept..
+
+
+Challenge 2: "Write a script that allows you to capture/display historical
+data. It could be an object or a scalar. For example
+
+        my $x = 10; $x = 20; $x -= 5;
+
+After the above operations, it should list $x historical value in order."
+
+My notes: The idea is easy, but we're not told the API to implement.  I'm
+certainly not going to introspect into Perl to find out whenever a scalar
+variable is assigned to!  I have chosen to implement this for numeric
+variables, using an input sequence of VARNAME OP VALUE triples (where OP='=',
+'+=', '-=', '*=', '/=' or '%='), where each input triple N occurs at time N,
+and we track the historic value of each variable over time.
+
+I did that, using __DATA__ (at the end of this file) for the default sequence,
+or the contents of a named input file if given.
+
+I also graphed the time-series results via Gnuplot as I seem to be having
+a Gnuplot kick this week:-)  It's not really the ideal output format, but
+it's relatively cute.