diff --git a/notebooks/numerical-computing-is-fun-3.ipynb b/notebooks/numerical-computing-is-fun-3.ipynb
index 665cfd5..dbd2649 100644
--- a/notebooks/numerical-computing-is-fun-3.ipynb
+++ b/notebooks/numerical-computing-is-fun-3.ipynb
@@ -79,10 +79,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 148,
-   "metadata": {
-    "collapsed": true
-   },
+   "execution_count": 1,
+   "metadata": {},
    "outputs": [],
    "source": [
     "def first_algo(left, right):\n",
@@ -99,10 +97,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 149,
-   "metadata": {
-    "collapsed": true
-   },
+   "execution_count": 2,
+   "metadata": {},
    "outputs": [],
    "source": [
     "first_algo(8, 4)"
@@ -117,10 +113,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 150,
-   "metadata": {
-    "collapsed": true
-   },
+   "execution_count": 3,
+   "metadata": {},
    "outputs": [],
    "source": [
     "def first_algo(left, right):\n",
@@ -130,7 +124,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 151,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [
     {
@@ -154,10 +148,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 152,
-   "metadata": {
-    "collapsed": true
-   },
+   "execution_count": 5,
+   "metadata": {},
    "outputs": [],
    "source": [
     "def first_algo(left, right):\n",
@@ -167,7 +159,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 153,
+   "execution_count": 6,
    "metadata": {},
    "outputs": [
     {
@@ -176,7 +168,7 @@
        "0"
       ]
      },
-     "execution_count": 153,
+     "execution_count": 6,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -194,7 +186,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 154,
+   "execution_count": 7,
    "metadata": {},
    "outputs": [
     {
@@ -203,7 +195,7 @@
        "1"
       ]
      },
-     "execution_count": 154,
+     "execution_count": 7,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -214,7 +206,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 155,
+   "execution_count": 8,
    "metadata": {},
    "outputs": [
     {
@@ -223,7 +215,7 @@
        "0"
       ]
      },
-     "execution_count": 155,
+     "execution_count": 8,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -234,7 +226,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 156,
+   "execution_count": 9,
    "metadata": {},
    "outputs": [
     {
@@ -243,7 +235,7 @@
        "120990"
       ]
      },
-     "execution_count": 156,
+     "execution_count": 9,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -261,10 +253,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 157,
-   "metadata": {
-    "collapsed": true
-   },
+   "execution_count": 10,
+   "metadata": {},
    "outputs": [],
    "source": [
     "def second_algo(left, right):\n",
@@ -274,7 +264,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 159,
+   "execution_count": 11,
    "metadata": {},
    "outputs": [
     {
@@ -283,7 +273,7 @@
        "True"
       ]
      },
-     "execution_count": 159,
+     "execution_count": 11,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -294,7 +284,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 160,
+   "execution_count": 12,
    "metadata": {},
    "outputs": [
     {
@@ -303,7 +293,7 @@
        "True"
       ]
      },
-     "execution_count": 160,
+     "execution_count": 12,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -314,7 +304,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 161,
+   "execution_count": 13,
    "metadata": {},
    "outputs": [
     {
@@ -323,7 +313,7 @@
        "False"
       ]
      },
-     "execution_count": 161,
+     "execution_count": 13,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -362,7 +352,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 162,
+   "execution_count": 14,
    "metadata": {},
    "outputs": [
     {
@@ -388,10 +378,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 163,
-   "metadata": {
-    "collapsed": true
-   },
+   "execution_count": 15,
+   "metadata": {},
    "outputs": [],
    "source": [
     "if 1 is 2: \n",
@@ -422,7 +410,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 164,
+   "execution_count": 16,
    "metadata": {},
    "outputs": [
     {
@@ -445,7 +433,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 165,
+   "execution_count": 17,
    "metadata": {},
    "outputs": [
     {
@@ -475,10 +463,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 166,
-   "metadata": {
-    "collapsed": true
-   },
+   "execution_count": 18,
+   "metadata": {},
    "outputs": [],
    "source": [
     "def third_algo(left, right):\n",
@@ -492,7 +478,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 167,
+   "execution_count": 19,
    "metadata": {},
    "outputs": [
     {
@@ -501,7 +487,7 @@
        "True"
       ]
      },
-     "execution_count": 167,
+     "execution_count": 19,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -512,7 +498,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 168,
+   "execution_count": 20,
    "metadata": {},
    "outputs": [
     {
@@ -521,7 +507,7 @@
        "False"
       ]
      },
-     "execution_count": 168,
+     "execution_count": 20,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -553,10 +539,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 169,
-   "metadata": {
-    "collapsed": true
-   },
+   "execution_count": 21,
+   "metadata": {},
    "outputs": [],
    "source": [
     "def third_algo(left, right):\n",
@@ -597,16 +581,16 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 170,
+   "execution_count": 22,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "[0, 1, 2]"
+       "range(0, 3)"
       ]
      },
-     "execution_count": 170,
+     "execution_count": 22,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -617,16 +601,16 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 171,
+   "execution_count": 23,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]"
+       "range(0, 10)"
       ]
      },
-     "execution_count": 171,
+     "execution_count": 23,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -637,16 +621,16 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 172,
+   "execution_count": 24,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "[10, 11, 12, 13, 14, 15, 16, 17, 18, 19]"
+       "range(10, 20)"
       ]
      },
-     "execution_count": 172,
+     "execution_count": 24,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -664,16 +648,16 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 173,
+   "execution_count": 25,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "[25, 26, 27]"
+       "range(25, 28)"
       ]
      },
-     "execution_count": 173,
+     "execution_count": 25,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -684,16 +668,16 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 174,
+   "execution_count": 26,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "[11, 12, 13, 14, 15, 16, 17]"
+       "range(11, 18)"
       ]
      },
-     "execution_count": 174,
+     "execution_count": 26,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -711,16 +695,16 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 175,
+   "execution_count": 27,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "[2, 4, 6, 8, 10, 12, 14, 16, 18]"
+       "range(2, 20, 2)"
       ]
      },
-     "execution_count": 175,
+     "execution_count": 27,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -738,16 +722,16 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 176,
+   "execution_count": 28,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "[1, 3, 5, 7, 9, 11, 13, 15, 17, 19]"
+       "range(1, 20, 2)"
       ]
      },
-     "execution_count": 176,
+     "execution_count": 28,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -793,7 +777,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 177,
+   "execution_count": 30,
    "metadata": {},
    "outputs": [
     {
@@ -811,7 +795,7 @@
    "source": [
     "for number in range(5):\n",
     "    \n",
-    "    print number"
+    "    print (number)"
    ]
   },
   {
@@ -837,10 +821,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 178,
-   "metadata": {
-    "collapsed": true
-   },
+   "execution_count": 31,
+   "metadata": {},
    "outputs": [],
    "source": [
     "answer =  1 is 1"
@@ -848,7 +830,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 179,
+   "execution_count": 32,
    "metadata": {},
    "outputs": [
     {
@@ -857,7 +839,7 @@
        "True"
       ]
      },
-     "execution_count": 179,
+     "execution_count": 32,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -875,10 +857,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 180,
-   "metadata": {
-    "collapsed": true
-   },
+   "execution_count": 33,
+   "metadata": {},
    "outputs": [],
    "source": [
     "def third_algo(left, right):\n",
@@ -905,10 +885,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 181,
-   "metadata": {
-    "collapsed": true
-   },
+   "execution_count": 34,
+   "metadata": {},
    "outputs": [],
    "source": [
     "def fourth_algo(left, right):\n",
@@ -944,7 +922,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 184,
+   "execution_count": 36,
    "metadata": {},
    "outputs": [
     {
@@ -976,12 +954,12 @@
     "    # then we create a conditional statement for cases when it's true\n",
     "    if result is 0: \n",
     "        \n",
-    "        print True\n",
+    "        print (True)\n",
     "        \n",
     "    # and finish with else for cases when it's false \n",
     "    else: \n",
     "\n",
-    "        print False"
+    "        print (False)"
    ]
   },
   {
@@ -993,7 +971,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 188,
+   "execution_count": 37,
    "metadata": {},
    "outputs": [
     {
@@ -1020,10 +998,10 @@
     "    result = left % right\n",
     "    \n",
     "    if result is 0:         \n",
-    "        print True\n",
+    "        print (True)\n",
     "        \n",
     "    else: \n",
-    "        print False"
+    "        print (False)"
    ]
   },
   {
@@ -1035,7 +1013,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 190,
+   "execution_count": 38,
    "metadata": {},
    "outputs": [
     {
@@ -1062,10 +1040,10 @@
     "    result = left % right\n",
     "    \n",
     "    if result is 0:         \n",
-    "        print True\n",
+    "        print (True)\n",
     "        \n",
     "    else: \n",
-    "        print False"
+    "        print (False)"
    ]
   },
   {
@@ -1077,10 +1055,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 196,
-   "metadata": {
-    "collapsed": true
-   },
+   "execution_count": 39,
+   "metadata": {},
    "outputs": [],
    "source": [
     "def fifth_algo(left, right): \n",
@@ -1091,10 +1067,10 @@
     "        result = left % right\n",
     "\n",
     "        if result is 0:         \n",
-    "            print True\n",
+    "            print (True)\n",
     "\n",
     "        else: \n",
-    "            print False"
+    "            print (False)"
    ]
   },
   {
@@ -1106,7 +1082,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 197,
+   "execution_count": 40,
    "metadata": {},
    "outputs": [
     {
@@ -1133,10 +1109,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 200,
-   "metadata": {
-    "collapsed": true
-   },
+   "execution_count": 43,
+   "metadata": {},
    "outputs": [],
    "source": [
     "def sixth_algo(left):  # <-- changed\n",
@@ -1147,15 +1121,15 @@
     "        result = left % right\n",
     "\n",
     "        if result is 0:         \n",
-    "            print True\n",
+    "            print (True)\n",
     "\n",
     "        else: \n",
-    "            print False"
+    "            print (False)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 202,
+   "execution_count": 44,
    "metadata": {},
    "outputs": [
     {
@@ -1177,7 +1151,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 203,
+   "execution_count": 45,
    "metadata": {},
    "outputs": [
     {
@@ -1201,7 +1175,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 204,
+   "execution_count": 46,
    "metadata": {},
    "outputs": [
     {
@@ -1240,10 +1214,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 206,
-   "metadata": {
-    "collapsed": true
-   },
+   "execution_count": 47,
+   "metadata": {},
    "outputs": [],
    "source": [
     "def seventh_algo(left):\n",
@@ -1272,7 +1244,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 207,
+   "execution_count": 48,
    "metadata": {},
    "outputs": [
     {
@@ -1281,7 +1253,7 @@
        "0"
       ]
      },
-     "execution_count": 207,
+     "execution_count": 48,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -1299,7 +1271,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 211,
+   "execution_count": 49,
    "metadata": {},
    "outputs": [
     {
@@ -1308,7 +1280,7 @@
        "0"
       ]
      },
-     "execution_count": 211,
+     "execution_count": 49,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -1326,10 +1298,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 212,
-   "metadata": {
-    "collapsed": true
-   },
+   "execution_count": 50,
+   "metadata": {},
    "outputs": [],
    "source": [
     "def eight_algo(left):\n",
@@ -1348,7 +1318,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 213,
+   "execution_count": 51,
    "metadata": {},
    "outputs": [
     {
@@ -1357,7 +1327,7 @@
        "True"
       ]
      },
-     "execution_count": 213,
+     "execution_count": 51,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -1368,7 +1338,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 214,
+   "execution_count": 52,
    "metadata": {},
    "outputs": [
     {
@@ -1377,7 +1347,7 @@
        "True"
       ]
      },
-     "execution_count": 214,
+     "execution_count": 52,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -1388,7 +1358,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 215,
+   "execution_count": 53,
    "metadata": {},
    "outputs": [
     {
@@ -1397,7 +1367,7 @@
        "False"
       ]
      },
-     "execution_count": 215,
+     "execution_count": 53,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -1439,25 +1409,32 @@
    "source": [
     "<img width='600px' align='left' src='https://img.buzzfeed.com/buzzfeed-static/static/2014-01/enhanced/webdr03/22/3/anigif_enhanced-buzz-18421-1390379498-12.gif'>"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 2",
+   "display_name": "Python 3",
    "language": "python",
-   "name": "python2"
+   "name": "python3"
   },
   "language_info": {
    "codemirror_mode": {
     "name": "ipython",
-    "version": 2
+    "version": 3
    },
    "file_extension": ".py",
    "mimetype": "text/x-python",
    "name": "python",
    "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython2",
-   "version": "2.7.10"
+   "pygments_lexer": "ipython3",
+   "version": "3.5.4"
   }
  },
  "nbformat": 4,