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.
He's considered the largest breed in the world and can weigh 220 pounds or more. A Mastiff named Zorba, listed in the 1989 Guinness Book of Records, weighed in at 323 pounds. Although the Mastiff's size makes him appear fierce, his temperament is one of good-natured docility.