clarification about experimenting; added default import clarification

notebooks/about_this_workshop.ipynb

 {
  "metadata": {
   "name": "",
-  "signature": "sha256:fc454c5edcc53ce3f39585e61fda6a02b56561debd910c358dc6bc07a394048c"
+  "signature": "sha256:e7d6cf30802c4d390c3070d05c8a43f84ea2ac3448983c9eac409c31fe9e20c0"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -41,14 +41,14 @@
       "Experimenting\n",
       "-----\n",
       "\n",
-      "Code cells are meant to be interactive. If you see a cell like this, you should be able to select it, and from the menu \"Cell\" above, click \"Run\":"
+      "Code cells are meant to be interactive. We may present you with several options for experimentation, e.g. choices of variables, audio files, and algorithms. For example, if you see a cell like this, then try all of the possible options by uncommenting the desired line(s) of code. (To run the cell, select \"Cell\" and \"Run\" from the top menu, or press `Shift-Enter`.)"
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "import scipy\n",
+      "#import scipy\n",
       "\n",
       "x = scipy.arange(100)\n",
       "# x = scipy.randn(100)\n",
@@ -62,7 +62,7 @@
       {
        "metadata": {},
        "output_type": "pyout",
-       "prompt_number": 5,
+       "prompt_number": 1,
        "text": [
         "array([ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16,\n",
         "       17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33,\n",
@@ -73,14 +73,15 @@
        ]
       }
      ],
-     "prompt_number": 5
+     "prompt_number": 1
     },
     {
-     "cell_type": "markdown",
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
      "metadata": {},
-     "source": [
-      "then try all of the possible options!"
-     ]
+     "outputs": []
     }
    ],
    "metadata": {}

notebooks/get_good_at_ipython.ipynb

 {
  "metadata": {
   "name": "",
-  "signature": "sha256:7a2cffc20f7bf3507e91b2fd0b80e7fe188ce17ff878fce17d603fc08c2b86e7"
+  "signature": "sha256:3e47f19e4e3e474f96e45baef06f1047acd575cc2b8630e22591c25ead559a32"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -50,6 +50,18 @@
       "To display the Help Menu, press `h`."
      ]
     },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "Default Imports\n",
+      "-----\n",
+      "\n",
+      "If you run IPython inside the [`stanford-mir` Vagrant box](https://vagrantcloud.com/stevetjoa/stanford-mir) used for this workshop, every IPython notebook will automatically have the following packages imported: `numpy`, `scipy`, `matplotlib`.\n",
+      "\n",
+      "To view the IPython configuration file, visit `~/.ipython/profile_default/ipython_config.py`."
+     ]
+    },
     {
      "cell_type": "markdown",
      "metadata": {},