The Cambrian Explosion, the biggest puzzle of life in the scientific community today———— More than 500 million years ago, the single-cell life on Earth suddenly underwent an evolution similar to mutation, and various brilliant creatures were born "out of thin air". The ancestors of all current species appeared in that short period of time, and various species evolved at the speed of light hundreds of millions of times faster than now. It was a brilliant era. Unfortunately, brilliant things are always short-lived. After the short "Cambrian Period", life on Earth entered an era of turtle-speed evolution for 500 to 600 million years. And humans, who were half a beat faster than others in the turtle race, became the leader of life on Earth. But now——the greater "Second Era" has come again. In the light-speed evolution, humans were pulled down from the throne of the food chain in the shortest time, and life on Earth ushered in the second brilliant explosion. The real doomsday is no longer brainless zombies and desolate land, but——the doomsday of mankind, the paradise of the whole earth!