ownership

When an AI generates art, who owns it? And is using millions of artists' work to train that AI fair? Courts in the US, UK, Germany, and China are giving different answers.

Say a working time machine turns up tomorrow, an artifact and not a theory. Before anyone uses it, scientists would have to prove it is real, governments would fight over who owns it, and the first people through the door would run into the causality wall that makes time travel physics so strange.