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.
GENERAL. 1  The Giant Maso Mastiff is a new and still a developing breed that is being developed with the aim to produce a healthier version of Old English Mastiff dog that can live longer. Originating in Germany, these dogs have more English Mastiff in them than the other parent breed, the Cane Corso Itliano.