Yao, Numerical simulation and experimental study on differential pressure casting of aluminum steering knuckle.
It's believed that the more than 180 million years of evolution that brought the world to the Cretaceous point was destroyed in less than the lifetime of a Tyrannosaurus rex, which is about 20 to 30 years.
This mass extinction paved the way for the rise of mammals and the appearance of humans.
Called spherules, these small particles covered the planet with a thick layer of soot.