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.
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.