diff --git a/benchmarks/palindrome_timeit.ipynb b/benchmarks/palindrome_timeit.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:842cb7ae4f520376ff820e7bcd278db91a026ac1fa159ca6e8a4b38296bc10f5"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "Sebastian Raschka 04/2014\n",
+      "\n",
+      "#Timing different Implementations of palindrome functions"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import re\n",
+      "import timeit\n",
+      "\n",
+      "# All functions return True if an input string is a palindrome. Else returns False.\n",
+      "\n",
+      "\n",
+      "\n",
+      "####\n",
+      "#### case-insensitive ignoring punctuation characters\n",
+      "####\n",
+      "\n",
+      "def palindrome_short(my_str):\n",
+      "    stripped_str = \"\".join(l.lower() for l in my_str if l.isalpha())\n",
+      "    return stripped_str == stripped_str[::-1]\n",
+      "\n",
+      "def palindrome_regex(my_str):\n",
+      "    return re.sub('\\W', '', my_str.lower()) == re.sub('\\W', '', my_str[::-1].lower())\n",
+      "\n",
+      "####\n",
+      "#### functions considering all characters (case-sensitive)\n",
+      "####\n",
+      "\n",
+      "def palindrome_reverse1(my_str):\n",
+      "    return my_str == my_str[::-1]\n",
+      "\n",
+      "def palindrome_reverse2(my_str):\n",
+      "    return my_str == ''.join(reversed(my_str))\n",
+      "\n",
+      "def palindrome_recurs(my_str):\n",
+      "    if len(my_str) < 2:\n",
+      "        return True\n",
+      "    if my_str[0] != my_str[-1]:\n",
+      "        return False\n",
+      "    return palindrome(my_str[1:-1])\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "test_str = \"Go hang a salami. I'm a lasagna hog.\"\n",
+      "\n",
+      "print('case-insensitive functions ignoring punctuation characters')\n",
+      "%timeit palindrome_short(test_str)\n",
+      "%timeit palindrome_regex(test_str)\n",
+      "\n",
+      "print('\\n\\nfunctions considering all characters (case-sensitive)')\n",
+      "%timeit palindrome_reverse1(test_str)\n",
+      "%timeit palindrome_reverse2(test_str)\n",
+      "%timeit palindrome_recurs(test_str)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "case-insensitive functions ignoring punctuation characters\n",
+        "100000 loops, best of 3: 15.4 \u00b5s per loop"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n",
+        "10000 loops, best of 3: 20.3 \u00b5s per loop"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n",
+        "\n",
+        "\n",
+        "functions considering all characters (case-sensitive)\n",
+        "1000000 loops, best of 3: 508 ns per loop"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n",
+        "100000 loops, best of 3: 3 \u00b5s per loop"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n",
+        "1000000 loops, best of 3: 509 ns per loop"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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