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AMERICAN democracy has suffered a grave assault—yet political leaders from its two main parties cannot agree on how or even whether to investigate.

EIGHT years ago Ashraf Ghani and Clare Lockhart wrote a book called “Fixing Failed States”. Now Mr Ghani is in a position to follow his own advice. He is the president of Afghanistan, a state that failed in the 1990s and could fail again. State failure causes untold misery (see article).

I’M SORRY, Dave. I’m afraid I can’t do that.” With chilling calm, HAL 9000, the on-board computer in “2001: A Space Odyssey”, refuses to open the doors to Dave Bowman, an astronaut who had ventured outside the ship. HAL’s decision to turn on his human companion reflected a wave of fear about intelligent computers.

WITHIN hours of the Brexit referendum last summer David Cameron had resigned, and within three weeks Theresa May had succeeded him as prime minister.

THE news that average wages grew by 2.9% in December, the final full month of the Obama presidency, provides more evidence that America’s labour market is heating up. For some time, America has been creating plentiful jobs—2016 was the fifth consecutive year with more than 2m job gains.

To mark the publication of “Go Figure”, a collection of The Economist’s explainers and daily charts, the editors of this blog solicited ideas on Facebook and Twitter. This week we publish five explainers suggested by our readers, who will each receive a copy of the book.

IN PHAKALANE, an affluent suburb of Botswana’s sleepy capital Gaborone, a modern assembly line spits out thousands of batteries destined for southern African cars.

LARGE food companies have long been among the world’s most solid, with reassuringly consistent returns even in hard times. None would seem steadier than Nestlé, based in the Swiss town of Vevey, on a lake near snowy peaks.

IN 2015, a bit over two years after Hurricane Sandy hit his city, Bill de Blasio, New York’s mayor, announced the creation of a $3 billion restoration fund. Part of the money is intended to pay for sea walls that will help protect the place from future storms.

INDUSTRIAL policy via Twitter is a new development in economics but we may all have to get used to it over the next four (or eight) years. Donald Trump's tweets on the car industry (and his planned cuts to corporate income tax) may or may not have persuaded Ford to keep a plant in Michigan, creating 700 jobs.

To mark the publication of “Go Figure”, a collection of The Economist’s explainers and daily charts, the editors of this blog solicited ideas on Facebook and Twitter. This week we publish five explainers suggested by our readers, who will each receive a copy of the book.

SLYLY and without warning, on January 2nd Republican congressmen announced as their first major initiative of the new year a scheme so crassly self-interested as to suggest they had learned nothing from the old one.