What does "manifest destiny" mean when applied to the stars? During his inauguration speech, President Donald Trump invoked the controversial doctrine, originally used to justify American ...
Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.
Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.