1.  A 3 dog night is one so cold that it helps to have 3 dogs bundling in bed with you to keep warm.  Some say the term originated in the Australian outback, others say that it      came from dog sledders in the Arctic.
  2. A byte is a unit of digital information that most commonly consists of  bits
  3. A Dormin is a spirit in the Hobbit whose soul has been split into 16 pieces and, for having committed an unforgivable act, sealed in gigantic stones. Spelled backwards, it is “Nimrod”.
  4. Niagara Falls froze completely through in the winters of 1911 and 1932.  However, there is always a small trickle of water that does not freeze.
  5. Leonardo da Vinci invented scissors.