Borders were tightened, partly by investing in scanning systems (to spot people hidden in trucks) but mostly by demanding visas of migrants from hotspots such as Zimbabwe.

ECONOMIST: IMMIGRATION

Throughout, he kept scanning the nearly empty hall, trying to spot his father, Lang Guoren.

NEWYORKER: The Olympian

With this, the scanning beam is not directed at any single spot, but moves around, so the plastic does not burn.

ECONOMIST: Recycling