Members of the biggest trade union in Germany are on strike in a dispute that centres on workers' demand for time off to look after their families.
This week's strikes could be the first of many. So why do they matter? And what do they say about Germany in 2018?
We've boiled the story down to 100 words and 400 words - you can read them individually or one after the other.
Rare all-day strikes by thousands of German metal and engineering workers started on Wednesday and will end on Friday. About 260 companies are affected.
Their union, IG Metall, wants an 8% pay rise spread over a few years.
But they also want companies to let workers reduce their weekly hours from 35 to 28 on full pay if they need to care for children or elderly or sick relatives, before returning to full-time work after two years.
This last point is the big bone of contention - companies are willing to negotiate on pay but not on the reduced hours option.
IG Metall is one of the biggest unions in Europe, with 3.9 million members. So when its members decided to go on strike, it was a significant development.
Thousands of members of the metals and engineering union have walked out in one-day "warning strikes" between Tuesday and Friday. They were the union's first such strikes in 34 years.
Among the companies affected are Porsche and Daimler, which produces Mercedes-Benz cars.
The dispute comes down to two main points.
Firstly, the union wants a pay rise of 8% for its staff over the next 27 months. Employers have offered a 6.8% increase.
Secondly, it also wants:
companies to let workers have the option of cutting their weekly hours from 35 to 28, to allow them to look after their children or elderly or sick relatives
the same option for those shift workers who do more dangerous work
a guarantee that those workers can return to full-time work after two years
a guarantee that those workers are still paid the same even if they reduce their hours
IG Metall chief Joerg Hofmann said: "We need pay to be subsidised, so that children, caring for family and health don't depend on how much you have in your wallet."
But Oliver Zander, of metals industry federation Gesamtmetall, disagrees. "The basic principle that whoever works less also earns less, must continue to apply," he told Die Welt. "We can not shake it."