Francium was discovered by Marguerite Perey in 1939 when she was researching the radioactive decay of actinium-227. The discovery took place at the Curie Institute in Paris. The element takes its name from the country of its discovery â France.
Worldâs Biggest Dog, Worldâs Heaviest Dog. Hercules: The Worldâs Biggest Dog Ever According to Guinness World Records. Hercules was recently awarded the honorable distinction of Worlds Biggest Dog by Guinness World Records. Hercules is an English Mastiff and whas a 38 inch neck and weighs 282 pounds.
Largest Dog Breeds: French Mastiff The Dogue de Bordeaux is said to have the largest head in the canine world in proportion to the rest of the body. The average Dogue de Bordeaux measures 23 to 30 inches, and weighs 120 to 145 pounds.