Facebook and Twitter seem less relevant by the day. They may be replaced by new “federated” platforms.
The growth of the medieval city of Angkor involved wealthy elites pushing people off the land they had made valuable.
Neglect and inertia pose bigger threats to cities than the pandemic does.
Roughly 375 million years ago, the number of species on Earth plummeted. But extinction rates remained steady. What changed was that new species failed to emerge.