Volume 544 Number 7649

Editorials

Nature supports the March for Science p.137

Critics of the March for Science have a point. But those scientists who will protest and speak up globally for research have the chance to make a greater one.

doi: 10.1038/544137a

News

News Features

News & Views

Liquid crystals in living tissue p.164

Evidence has been found that a biological tissue might behave like a liquid crystal. Even more remarkably, topological defects in this liquid-crystal system seem to influence cell behaviour. A materials physicist and a biologist discuss what the findings mean for researchers in their fields. See Letter p.212

doi: 10.1038/544164a

The race to fish slows down p.165

A fishery can allow participants to fish as hard as they can until its quota is reached, or allocate quota shares that can be caught at any time. A comparison of the systems in action reveals that shares slow the race to fish. See Letter p.223

doi: 10.1038/nature21906

Screen printing of 2D semiconductors p.167

Atomically thin semiconductors have been made by transferring the oxide 'skin' of a liquid metal to substrates. This opens the way to the low-cost mass production of 2D semiconductors at the sizes needed for electronics applications.

doi: 10.1038/nature21908

Crown-of-thorns no more p.168

The starfish Acanthaster planci destroys coral reefs. Whole- genome sequences provide clues to the proteins that mediate A. planci outbreaks — information that might be used to help protect coral. See Letter p.231

doi: 10.1038/nature21905

How the lizard gets its speckled scales p.170

Can a reptile compute? In one species of lizard, Timon lepidus, the colour and pattern of its scales evolve in a manner akin to a discrete rule-based computation called a cellular automaton. See Letter p.173

doi: 10.1038/544170a

Human genes lost and their functions found p.171

Individuals who lack a functional copy of a gene — gene knockouts — can reveal the gene's role. Most knockout research has used model organisms, but now a comprehensive catalogue of human knockouts is in sight. See Letter p.235

doi: 10.1038/544171a

Articles

A living mesoscopic cellular automaton made of skin scales p.173

A mesoscopic cellular automaton arising from a microscopic reaction–diffusion system as a function of skin thickness is observed in ocellated lizards, showing that cellular automata are not merely abstract computational systems, but can directly correspond to processes generated by biological evolution.

doi: 10.1038/nature22031

Letters

Star formation inside a galactic outflow p.202

Star formation at a rate of more than 15 solar masses a year has been observed inside a massive outflow of gas from a nearby galaxy; this could also be happening inside other galactic outflows.

doi: 10.1038/nature21677

Catch shares slow the race to fish p.223

A large-scale treatment–control meta-analysis of US fisheries provides evidence that the implementation of catch shares extend fishing seasons by slowing the race to fish.

doi: 10.1038/nature21728

Evolutionary dynamics on any population structure p.227

The authors derive a condition for how natural selection chooses between two competing strategies on any graph for weak selection, elucidating which population structures promote certain behaviours, such as cooperation.

doi: 10.1038/nature21723

Re-evaluation of learned information in Drosophila p.240

Depending on prediction accuracy at the time of memory recall, specific mushroom body output neurons drive different combinations of dopaminergic neurons to extinguish or reconsolidate appetitive memory in Drosophila.

doi: 10.1038/nature21716