1) The blue whale is the largest animal to have ever existed, with an average length of about 82 feet (25 meters).

2) In Norse mythology, the Valkyries are divine maidens who serve Odin, the chief god. They are responsible for selecting warriors worthy of entering Valhalla and escorting them to the afterlife. They are often depicted as powerful and beautiful figures, riding winged horses and wielding spears.

3) The speed of a sneeze can reach up to 100 miles per hour (160 kilometers per hour).

4) The New England Patriots and the Pittsburgh Steelers hold the record for the most Super Bowl wins, with six championships each.