Science
The Great Oxidation Event: When Life Nearly Destroyed Itself
2.4 billion years ago, cyanobacteria flooded Earth with a toxic gas called oxygen, triggering the planet's first mass extinction and making complex life possible.
Casey Cooper·
Geology
3 articles
Nature
The Underground Cities Waiting on the Moon and Mars
Lava tubes beneath the lunar and Martian surfaces could be large enough to shelter entire settlements. Robots are already learning to explore them.
Casey Cooper·
Science
The Oldest Rocks on Earth: A Window to the Hadean
In a remote corner of northern Quebec lies a rocky outcrop that dates back 4.16 billion years, the only surviving fragment from Earth's violent, molten youth.
Casey Cooper·