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Whether the devices help people to quit, or increase health risks, will emerge only from better data.

doi: 10.1038/d41586-019-01785-4

p.415

doi: 10.1038/d41586-019-01983-0

p.423

A report shows that children living with adults who were forcibly separated from their families are more likely to face a host of challenges.

doi: 10.1038/d41586-019-01948-3

p.424

Lasers and quantum calculations help metrologists to update centuries-old mercury methods.

doi: 10.1038/d41586-019-01950-9

p.425

Researchers hope the conclusions of a people’s tribunal will pressure journals to reject papers that might include data from unethical transplants.

doi: 10.1038/d41586-019-01890-4

p.426

Nature's Amy Maxmen reports from the front line of the crisis in the Democratic Republic of the Congo.

doi: 10.1038/d41586-019-01957-2

p.427

At issue is whether growth factors are exempt from export restrictions; a judge will soon decide whether to continue to trial.

doi: 10.1038/d41586-019-01901-4

p.429

doi: 10.1038/d41586-019-01985-y

p.433

doi: 10.1038/d41586-019-01986-x

p.448

doi: 10.1038/d41586-019-01964-3

p.449

Some bacteria naturally transfer pieces of their DNA within and between species. Such a piece of DNA has been engineered to act as a molecular ‘Trojan horse’ that unleashes a toxin to selectively kill antibiotic-resistant Vibrio cholerae bacteria.

doi: 10.1038/d41586-019-01852-w

p.450

doi: 10.1038/d41586-019-01965-2

p.452

A module for implementing robust feedback control in synthetic cellular networks has been reported. Its design is first proved mathematically to be universal for all networks, and then implemented in living cells.

doi: 10.1038/d41586-019-01772-9

p.453

Tests of whether a range of gut bacteria can metabolize a diverse group of drugs has revealed that all the microbes metabolized some drugs and that more than half of the drugs were metabolized.

doi: 10.1038/d41586-019-01851-x

p.455

doi: 10.1038/s41586-019-1306-0

p.462

doi: 10.1038/s41586-019-1291-3

p.468

doi: 10.1038/s41586-019-1250-z

p.474

doi: 10.1038/s41586-019-1252-x

p.480

doi: 10.1038/s41586-019-1320-2

p.484

doi: 10.1038/s41586-019-1319-8

p.491

doi: 10.1038/s41586-019-1322-0

p.496

doi: 10.1038/s41586-019-1293-1

p.500

doi: 10.1038/s41586-019-1317-x

p.504

doi: 10.1038/s41586-019-1260-x

p.509

doi: 10.1038/s41586-019-1261-9

p.514

doi: 10.1038/s41586-019-1310-4

p.519

doi: 10.1038/s41586-019-1290-4

p.523

doi: 10.1038/s41586-019-1289-x

p.528

doi: 10.1038/s41586-019-1276-2

p.533

doi: 10.1038/s41586-019-1321-1

p.538

doi: 10.1038/s41586-019-1307-z