+Loading Data from Disk
+----------------------
+Numpy NB.
+=========
+**Remind me to look at some actual numpy usage at the end**
+
+- I think numpy does some type coercion when creating arrays.
+- Arrays created by ``numpy.genfromtxt`` can not in general be indexed like
+ ``data[xstart:xend, ystart:yend]``.
+- Data of unequal types are problematic! Pandas *may* be a better choice in
+ that case.
+- Specifying some value for ``dtype`` is probably necessary in most cases in
+ practice: https://docs.scipy.org/doc/numpy/reference/arrays.dtypes.html
+