The Japanese spider crab is the largest arthropod in the world, with a leg span of up to 4 meters (13 feet).
The Tokyo Marathon, first held in 2007, has become one of the most popular marathons in the world, with over 30,000 runners participating each year.
Japan's isolationist policy during the Edo period limited contact with the outside world but allowed for the development of unique cultural practices and traditions.
