According to the ecological habits of cockroaches, a biologist once came to a conclusion: if there is a global nuclear war on the earth one day, all creatures in the affected area, including humans and even fish, will disappear, and only cockroaches will continue their lives.

This is because under normal circumstances, the radiation that the human body can bear is 5 rem, and once the total radiation exceeds 800 rem, it will die. Blattella germanica can tolerate 9000 ~ 105000 rem, and Periplaneta americana can tolerate 967500rem! (Indicates the radiation dose. The dose equivalent of rem is rem (rem)H[ Walter ](Sv) 1Sv= 100rem), so cockroaches can survive even if there is a nuclear explosion.

The US government spends $6,543.8+$0.5 billion annually to eliminate cockroaches, which is about twice the budget for AIDS prevention. ?

Most of them look the same, but if you look closely, you can still see the difference. At present, taxonomists divide cockroaches into about 6,000 species, of which about 50 species are pests, such as common Asian cockroaches.

In addition, Periplaneta americana, Blattella germanica, brown cockroach and Australian cockroach are also widely distributed. There are about 200 species in China, and the common indoor cockroaches are about 10, which varies from place to place. Common species are Blattella germanica, Periplaneta americana and periplaneta fuliginosa.