Many whales are toothless. They use a plate of comb-like fibre called baleen to filter small crustaceans and other creatures from the water.

The largest ocean liners pay a $250,000 toll for each trip through the Panama Canal. The canal generates fully one-third of Panama's entire economy.

Plutonium - first weighed on August 20th, 1942, by University of Chicago scientists Glenn Seaborg and his colleagues - was the first man-made element.

AMAZING FACTS