Change some of the Zebra puzzle front-matter

ipynb/Zebra_Puzzle.ipynb

@@ -4,7 +4,13 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "From: http://en.wikipedia.org/wiki/Zebra_Puzzle\n",
+    "# Zebra Puzzle\n",
+    "\n",
+    "This is a classic logic puzzle that is useful for demonstrating a constraint satisfaction problem (CSP).\n",
+    "It is sometimes referred to as either *Einstein's Puzzle*, or *Einstein's Riddle*,\n",
+    "due to an apocryphal story that it was invented by Albert Einstein as a boy.\n",
+    "\n",
+    "From http://en.wikipedia.org/wiki/Zebra_Puzzle:\n",
     "\n",
     "1. There are five houses.\n",
     "2. The Englishman lives in the red house.\n",
@@ -25,9 +31,7 @@
     "Answer the following:\n",
     "\n",
     "1. Who drinks water?\n",
-    "2. Who owns the zebra?\n",
-    "\n",
-    "— Life International, December 17, 1962"
+    "2. Who owns the zebra?"
    ]
   },
   {