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 English Mastiff is the largest dog breed based on its mass. It is the longest and heaviest dog breed in the world, however, it is not the tallest breed in the block. This dog breed has won several world records for its weight and strength.he English Mastiff is the largest dog breed based on its mass. It is the longest and heaviest dog breed in the world, however, it is not the tallest breed in the block. This dog breed has won several world records for its weight and strength.