Concentric circles on the sea floor near Japan, about 2 m (7 ft) in diameter with intricate ridged radial lines and valleys of sand, are what?
Pufferfish mating attractions Pufferfish are about 12 cm (5 ins) long, and create the displays over about 7 to 9 days. The circles were first observed by scientists near Japan in 1995.
What is a pre-Columbian Inca site located 2,430 metres (7,970 ft) above sea level, on a ridge above the Urubamba Valley in Peru?
Yukio Hatoyama, who became Prime Minister of Japan in September 2009, announced his resignation on 2 June 2010, citing what as the main reason?
