The discovery of two spectacular sites in China has revealed that shortly after the great Permian-Triassic extinction there was an explosion in the diversity of these animals.
In the 1970s, scientists discovered that the ozone layer, a stratospheric region that protects the Earth from ultraviolet radiation, was dangerously thinned by the use of certain chemicals.
Danni Büchner is invited to Sam Dylan's Halloween party. But the "Goodbye Germany" emigrant has no desire for many other party guests. And find clear words.
