What will the world be like if dinosaurs and mammoths revive?
What are the common points of giant creatures like dinosaurs, mammoths, and dodo birds? They are extinct. But what about the world if one day these animals ... revive?Video: The world alerted to light pollution
In Paris, France, at the end of the 18th century, people lit only half of the city's street lights on every full moon night. This is due to economic reasons instead of the