1) The world's tallest waterfall is Angel Falls in Venezuela, with a height of about 3,212 feet (979 meters).

2) The world's oldest tree is believed to be a bristlecone pine named "Methuselah" in California, estimated to be over 4,800 years old.

3) The shortest war in history lasted only 38 to 45 minutes between Britain and Zanzibar in 1896.

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