Top Highlights

• Universe is by definition a single entity and in principle its components interact.
• dark matter might ultimately (and indirectly) have been responsible for the extinction of the dinosaur.
• Our very measurement of time in terms of days and years signifies the relevance of our surroundings.
• five major mass extinctions,
• Meteors flash across the sky on a moonless night, unfamiliar animals shadow us when we hike through the woods, magnificent architectural details surround us as we walk through a town. Yet we often overlook these remarkable sights—even when they are directly in our field of view.