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.
Last but not the least onto my list of biggest dog breeds in the world is none other than a Tibetian Mastiff. They grow to a height of 24 to 26 inches, weighing about 85 to 140 pounds. They usually have a life span of about 10 to 14 years. Tibetan Mastiffs are highly intelligent and independent thinkers.