Though the average specimen in captivity might live 25 or 35 years, an old koi named Hanako, from Mino province in Japan, has been shown to be over 215 years old based on analysis of her scales, and other 100+ year old fish are known from the same pond. Koi, like wild carp, can grow to 36 or more under perfect conditions.
The gold and silver medals weigh 412 grams (0.9 pounds) and the bronze medal weighs 357 grams (0.78 pounds). They are the biggest and heaviest summer Olympic medals ever made.
The world's largest gold bar stands at 250 kg (551 lb), measuring at the base 45.5 cm Ã 22.5 cm and 17 cm high with 5 degree draft angle (equal to 15,730 cmÂ³, or 17.9 in Ã 8.9 in Ã 6.7 in â 1062.04 inÂ³). It was manufactured by the Mitsubishi Materials Corporation, a subsidiary of Mitsubishi.