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Space

Geophysicists push age of Earth’s magnetic field back 250 million years

South African rocks suggest that the earliest stages of life on Earth were protected from harmful solar radiation.

Earth

Arctic seafloor a big source of methane

Measurements show that Arctic undersea methane deposits, previously thought to be sealed by permafrost, are leaking into the atmosphere.

Life

Researchers distinguish two different types of blood stem cells

Working in mice, scientists find that red and white blood cells arise from different progenitors.

Physics

Aluminum superatoms may split water

Metal clusters could create hydrogen for fuel, simulations suggest.