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.
The Tibetan Mastiff impresses with his size, which is accentuated by his broad head and thick coat and mane. He is a family and property guardian who is aloof toward and watchful of strangers. Tibetan Mastiff males are 26 to 29 inches tall and usually weigh 100 to 140 pounds.ossibly created by blending the Irish Wolfhound and the Mastiff, the Great Dane was originally used to hunt boar and guard estates, but these days, heâs a family dog. Male Great Danes stand at least 30 inches tall and weigh a minimum of 120 pounds.