Update facts.json

contributed for swapagarwal#559

data/facts.json

@@ -16,5 +16,8 @@
     "Sean Connery wore a toupee in all his James Bond movies.",
     "All swans in England belong to the queen.",
     "Hacktoberfest is a month long celebration of open source software. You can win Tshirts by contributing in between 1st Oct to 31st Oct to open source."
+    "The world's quietest room is located at Microsoft's headquarters in Washington state."
+    "There are only three countries in the world that don't use the metric system : Liberia, Myanmar, and the United States."
+    "More than 52 percent of the world's population is under 30 years old."
   ]
-}
+}