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Neuroscience

Chickadees use memory ‘bar codes’ to find their hidden food stashes

Unique subsets of neurons in a chickadee’s memory center light up for each distinct cache, hinting at how episodic memories are encoded in the brain.

Neuroscience

Here’s how magnetic fields shape desert ants’ brains

Exposure to a tweaked magnetic field scrambled desert ants’ efforts to learn where home is — and affected neuron connections in a key part of the brain.

Earth

Earth’s oldest known earthquake was probably triggered by plate tectonics

Billion-year-old rocks in South Africa hold evidence for the onset of plate tectonics early in Earth’s history.

Earth

Climate change is changing how we keep time

Polar ice sheets are melting faster, slowing Earth’s spin.