An Zhenbao has no spider mystery.

There is a puzzling phenomenon in Anzhen Castle: it has been built for 100 years, and there is no spider web in any corner of the castle. Mysteriously, there are two murals in the fort, which were painted when the fort was built. One is "A Thousand Spiders Sweep Away", in which a fairy boy is sweeping away the fallen spiders with a broom; One is "Ten Thousand Bats Attract", in which a fairy boy waved a banana leaf to collect bats in a huge gourd. Look carefully, there are almost no traces of spiders in the fort, but cobwebs can be seen everywhere in the affiliated buildings dozens of meters away from the fort; And every summer and autumn night, there are indeed a large number of bats flying to the castle to live. Of course, the reason why there are no spiders in Anzhen Castle cannot be as simple as murals. So with the help of the teacher, Luo Chun and other students from Yong 'an No.1 Middle School explored the real reason why there were no spiders and mosquitoes in Anzhenbao by means of searching materials, investigation and interviews, field trips and hands-on experiments. After nearly one school year's research, it is finally concluded that the existence of a large number of bats is the direct reason why there are no spiders and mosquitoes in Anzhenbao; There are no spiders and mosquitoes in Anzhen Castle, because no one lives in the castle and there are no lights in the castle. Luo Chun and his classmates won the first prize in the 18th Fujian Youth Science and Technology Innovation Competition.