Volume 577 Number 7789

Editorial

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The physics of ice skating p.173

The slipperiness of ice is poorly understood at a microscopic level. Experiments that probe how the surface of ice melts and flows in response to wear help to explain the exceptionally low friction that underpins winter sports.

doi: 10.1038/d41586-019-03833-5

Brain states behind exploring and hunting revealed p.175

The brain fluctuates between different internal states, each of which drives particular behaviours. Brain-wide imaging reveals the internal states that help zebrafish larvae to choose between exploring and hunting.

doi: 10.1038/d41586-019-03811-x

Not all fast radio bursts are created equal p.176

Astronomical signals called fast radio bursts remain enigmatic, but a key discovery has now been made. A second repeating fast radio burst has been traced to its host galaxy, and its home bears little resemblance to that of the first.

doi: 10.1038/d41586-019-03894-6

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