02-numpy.md: Loading data: update introductory text (#657)

_episodes/02-numpy.md

@@ -29,11 +29,13 @@ specialized tools built up from these basic units live in
 that can be called upon when needed.
 
 ## Loading data into Python
-In order to load our inflammation data, we need to access
-([import]({{ page.root }}/reference/#import) in Python terminology) a library called
-[NumPy](http://docs.scipy.org/doc/numpy/ "NumPy Documentation") which stands for Numerical Python.
-In general you should use this library if you want to do fancy things with numbers,
-especially if you have matrices or arrays. We can import NumPy using:
+
+To begin processing inflammation data, we need to load it into Python.
+We can do that using a library called
+[NumPy](http://docs.scipy.org/doc/numpy/ "NumPy Documentation"), which stands for Numerical Python.
+In general, you should use this library when you want to do fancy things with lots of numbers,
+especially if you have matrices or arrays. To tell Python that we'd like to start using NumPy,
+we need to [import]({{ page.root }}/reference/#import) it:
 
 ~~~
 import numpy