Sixty-six million years ago, an asteroid impact triggered the extinction of non-avian dinosaurs. Yet, some early birds, ...

Influenza is a highly contagious viral infection that affects the respiratory system. Although often dismissed as a seasonal illness, it can lead to ...

Sixty-six million years ago, at the end of the Cretaceous Period, an asteroid impact near the Yucat n Peninsula of Mexico triggered the extinction of all known non-bird dinosaurs. But for the early ...