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.
Prevalence: Common. The mastiff is truly a giant among dogs. Full grown, males start at 30 inches tall and can weigh as much as 200 pounds (90 kilograms). Females start from about 27 inches in height and weigh around 150 pounds (68 kilograms). The mastiff is massive, powerful and muscular.