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 worldâs most expensive dog, Yangtze River No. 2, was a Tibetan Mastiff. A French Mastiff. (Image distributed under the Creative Commons Attribution-ShareAlike license.) Typically standing over 24 inches and weighing more than 100 lbs, the French Mastiff can be a terror if not socialized at an early age.