The "egg-laying" cliff in China confused the scientific world: It lays once every 30 years
A small cliff in China "lays" egg-shaped stones every 30 years , surprising scientists. Locals in the Jiannan Autonomous Prefecture in southwestern China’s Guizhou Province were amazed to see smooth and rounded stone eggs that protrude from the cliffs and then fall to the ground. The cliff is named Chan Da Ya (San Dan Nhai), which means “egg-laying cliff” in Chinese. Chan Da Ya cliff takes 30 years to “lay strange stone eggs”. This cliff has puzzled geologists for decades. Although there have been many theories and scientific explanations, no one has given the most accurate and convincing answer. This 2.4m high and 19m long cliff is like most other cliffs. The strange thing is that emerging in the middle of the rough cliff face are smooth circular convex surfaces of different sizes. Over time, these “egg stones” are getting bigger and bigger, gradually exposed and when they can’t stick to the wall...