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 Old English Mastiff is a massive dog. The Mastiff has a large, heavy, square head with a well-marked stop between the eyes. The muzzle should be half the length of the skull.hat is the only way your relationship with your dog can be a complete success. Height, Weight Height: Males from 30 inches (76 cm) Females from 27 inches (69 cm) Weight: Males about 160 pounds (72 kg) Females about 150 pounds (68 kg) One of the heaviest breeds, a male Mastiff can exceed 200 pounds.