Cretaceous–Paleogene extinction event
The Chicxulub impact didn’t just kill dinosaurs—it rewrote Earth’s chemistry in minutes.
Dinosaurs
The animals every child knows and every decade revises.
- 1
- in nature
- 10:16
- average
- 10 min
- in total
- 9
- across the network
All briefs
More from nature
All briefs →
Polar desert
A desert without sand, a biome without biology—polar deserts break every rule except the one that matters: cold overrides dry.
Autumn leaf color
Autumn leaf colour is not decay—it’s a metabolic pivot, timed to light and cold, that turns leaves into temporary solar shields and insect warning signs.
Bioluminescence
Light made by life isn’t magic — it’s chemistry that evolved 94 times, starting in corals half a billion years ago.
Phoneutria nigriventer
A spider that walks into your house, raises its front legs like a boxer, and injects neurotoxins that scramble your nervous system—no web required.