What are the complex connections between things? (Except "Snakes and Crops", "The Story of Deer and Wolf", and "Saving Australia's Butterflies")

The Mongolian grasslands are green and lush, with fragrant grass and wild flowers swaying in the wind; springs and rivers are clear, with rippling water and white clouds flowing on the water. On the grassland, wolves eat sheep and horses and are the biggest enemies of humans and livestock. However, wolves also eat voles, rabbits, and gazelles. Voles, rabbits, gazelles, etc. also eat grass. Grass is the main food for sheep and horses. Sheep and horses also eat grass. It is the main source of food for people. The grassland is a great mother, nurturing her people. These creatures form a huge biological kingdom and form an interlocking food chain. They restrict each other and reproduce with the grassland. The two have survived for tens of thousands of years. But one day, the Han people came to the grassland and saw wolves eating cattle and sheep. They felt that wolves were the enemies of cattle and sheep, so they used various methods to eliminate the wolves, and even shot the wolves with guns. They wanted to protect their cattle. sheep. But they forget that wolves are also beneficial to the grassland, because wolves also eat voles, yellow sheep and other major pests on the grassland, so there are not too many voles and yellow sheep on the grassland. This also preserves the green grass and allows cattle and sheep to have enough food. food sources. Only when the cattle are strong and the sheep are fat can the people live and work in peace and contentment. After a period of killing, finally one day, the wolves were killed to pieces and disappeared without a trace. They thought that there would be more cattle and sheep, but that was not the case. The voles, rabbits, and goats that escaped from the wolves' mouths multiplied in large numbers and ate up large tracts of green grass, often uprooting the grass. The grassland has lost its green grass, and the yellow skin is exposed everywhere. When the wind blows, the yellow sand fills the sky, blocking out the sun. Many places have turned into deserts. The entire grassland is shrouded in choking fine sand dust. The cattle and sheep are Without the fresh green grass, the number has dropped dramatically. People can no longer see the vast expanse of prairie, and there is no more wind-blown grassland where cattle and sheep can be seen grazing. Poor people, eager for quick success, destroyed the food chain, and ultimately destroyed the beautiful home they live in.

Wolves...grasslands

Cattle, sheep, voles, rabbits and gazelles

In the remote South China Sea of ??our country, there is a group of islands - the Paracel Islands. Although these islands are small, they are covered with green forests and home to various insects and seabirds. Uncles from the People's Liberation Army guard the motherland's maritime borders here day and night. Life on the island is hard. Not to mention food, even the fresh water for drinking and the soil for growing vegetables have to be transported from the mainland. The uncle of the People's Liberation Army was not afraid of difficulties and planted vegetables and flowers on the island, dressing it up like a garden. In order to improve their living conditions, they relied on their own efforts and raised chickens on the island. Later, after continuous breeding, the number of chickens increased. Just go around the woods and pick up a basket full of eggs. However, before long, for some reason, the rats here became a problem. Due to the danger of rats, a large number of chickens on the island died. In broad daylight, more than twenty chicks were killed by rats within an hour; at night, two or three large rats actually attacked the old hen. Due to the rat plague, the number of chickens is getting smaller and smaller. The chickens that were lucky enough to survive simply hid in the woods and never dared to come out again. "The mice are afraid of the cats, so let's ask the cats for help!" In order to eliminate the mice, the soldiers brought the cats to the island again. Sure enough, the mice were eliminated. However, when the soldiers patrolled the island, they found piles of boobies corpses under the low maple trees. After investigation, it turned out that the cat was responsible. Cats not only eat mice, but they also endanger precious boobies. Booby is an internationally protected bird. In order to prevent these slanderous cats from doing evil and killing boobies, the soldiers raised dogs. The dog's sense of smell is very sensitive. As soon as it finds a cat, it will pounce on the cat and bite it to death. The cats are gone and the mice are rampant again. Dogs love to fight and bark everywhere, disturbing the birds all day long. The uncles of the People's Liberation Army stationed on the island felt that there was really nothing they could do, so they had to write to scientists asking for help in solving the problem.

Britain is rich in clover, which is the main feed for cattle. Wild bees effectively pollinate the dark clover flowers. Clover's luxuriant growth is largely due to wild bees. However, voles like to eat the honey and larvae of wild bees, which affects the pollination of clover. Scholars have discovered that the reason why there are more wild bee nests near the British countryside than elsewhere is because there are many cats in the villages. Cats eat voles, so the clover grows abundantly there, providing abundant feed for the cattle. Clover was the main food for cattle, and the main food for the British navy was canned beef. So Clover came into contact with the British Navy again.

In this way, cows eat clover, wild bees help pollinate clover, voles eat the honey and larvae of wild bees, and cats eat voles, then cats are the major contributors to the flourishing of clover. From this point of view, the fact that Britain has a navy that dominates the sea should ultimately be attributed to cats, and furthermore, it should be attributed to the lady who raises cats.

The rail spacing of modern railways is 4 feet, 8.5 inches. The rail spacing adopts the standard of tram wheel spacing, and the tram wheel spacing standard follows the wheel spacing standard of horse-drawn carriages.

Why is the wheelbase of a carriage 4 feet 8.5 inches? It turns out that the width of British road tracks is 4 feet 8.5 inches. If the carriages were to use any other wheelbase, the wheels would soon be broken on the old British roads.

Where does the track width of British roads come from? This can be traced back to ancient Rome. Old roads throughout Europe (including Britain) were laid by the Romans for their armies, and 4 feet, 8 points and 5 inches was exactly the width of a Roman chariot.

Where did the width of Roman chariots come from? The answer is simple, it is the combined width of the buttocks of two horses pulling a chariot. The joke doesn't end here. The rocket boosters of the U.S. space shuttle cannot escape the entanglement of horses. After the rocket boosters are built, they must be transported by rail. There must be some tunnels on the railways, and the width of the tunnels is based on the width of the rails. The width of the rocket booster, which represents cutting-edge technology, is actually determined by the total width of the buttocks of two horses