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He argues that the tools of social media are just too sharp for young minds. On digital platforms teens parade themselves, often to an audience of strangers, and this is leading to addiction, paranoia and despair

For girls, the effect is especially acute. ‘What we’re seeing is a very sharp, sudden change in girls’ mental health all around the Anglosphere and the Nordic countries,’ he says. A big change was evident from 2013, when physical friendship groups started to be supplanted by smartphones and online chat. ‘But you cannot grow up in networks. You have to grow up in communities.’

boys who have religion in their lives seem to be less susceptible. ‘If you’re a kid who’s a religious conservative, on average, your mental health is not really much worse than it was ten years ago

But if you’re a secular liberal girl, you’re probably more than twice as likely to have a mental health problem.’

a University of Michigan survey into ‘self-derogation’ – i.e., how likely teenagers are to say they are ‘no good’ or ‘can’t do anything right’. Figures had been stable for years but started rising sharply ten years ago – except for among boys who identified as conservative and said that religion was important to them.

irls simply use social media more. But Professor Haidt also thinks they are more likely to buy into what he calls the ‘three great untruths’ of social media

The first is that they are fragile and can be harmed by speech and words.

Next, that their emotions, and especially their anxieties, are reliable guides to reality.

And finally, that society is one big battle between victims and oppressors. All this, he says, is the subtext to social media discourse.

‘It’s what I’ve been calling the phone-based child,’

So we had playdates in childhood, up until around 2010.’ In Britain, he says, the number of children who went on real-life playdates then fell sharply.

Social media is a bit of a misnomer, he says. It’s no longer about connecting people, but ‘performing on a platform’. Perhaps this is fine for grown-ups, but not for children, ‘where they can say things in public, including to strangers, and then be publicly shamed by potentially millions of people

Children should not be on social networks. They should be playing in person. Social media platforms should never be accessed by children until they’re 18. It’s just insane that we let kids do these things.’

I ask if he thinks all platforms are equally dangerous

‘TikTok is probably the worst for their intellectual development. I think it literally reduces their ability to focus on anything while stuffing them with little bits of stuff that was selected by an algorithm for emotional arousal. Not for truth.’

if you get your news from social media (which many people do – in the UK, Instagram has overtaken all newspapers as a news source), this can change your view of the world, especially as the algorithms tend to promote the most provocative views.

If asked to choose whether they side more with Israel or Hamas, ‘the great majority of Americans side with Israel, except for Gen Z, which is split 50-50’,

‘There was a Twitter thread recently showing how if you look at what people are saying on TikTok, you can understand why

TikTok and Twitter are incredibly dangerous for our democracy. I’d say they’re incompatible with the kind of liberal democracy that we’ve developed over the last few hundred years.’

Might it just be the case, I ask, that there’s less of a stigma around mental health now, so teenagers are far more likely to admit that they have problems?

why is it, then, that right around 2013 all these girls suddenly start checking into psychiatric inpatient units? Or suicide – they’re making many more suicide attempts. The level of self-harm goes up by 200 or 300 per cent, especially for the younger girls aged ten to 14

we see very much the same curves, at the same time, for behaviour. Suicide, certainly, is not a self-report variable. This is real. This is the biggest mental health crisis in all of known history for kids.’

he increased number of suicides since 2010 is so large that I suspect this is among the largest public health threats to children since the major diseases were wiped out

In Britain, suicide rates started rising in 2014, up about 20 per cent for boys (to 420 a year) and 60 per cent for girls (to 160 a year).

What should parents do? They know that if they try to remove their teenager’s smartphone, their child will accuse them of destroying his or her social life. ‘That’s a perfect statement of what we call a collective action problem,’

‘Any one person doing the right thing is in big trouble. But why do we ever let our kids on social media? It’s only down to the dynamic you just said.’ New norms are needed, he says. And his book will suggest four.

Rule one, he says: no smartphones before the age of 14.

‘Give them a flip phone. Millennials had flip phones. They texted each other

Rule two: no social media before 16

His third rule: no phones in schools.

finally: more unsupervised play. ‘Both of our countries freaked out in the 1990s, locked up our kids because we lost trust in each other. We thought everyone was a child molester or a rapist.’ Children and teens could do with six or seven hours each day out of contact with their parents, he argues. Keeping them inside risks more harm than the outside world would pose.

Who was attracted to this movement? Many were careerists: people happy to serve as apparatchiks, following whatever the party line happened to be at the moment.

when I say that I miss voodoo economics, what I really mean is that I miss the illusion — which I shared — that the impact of its rise would mainly be limited to the politics of taxes and spending. What we now know is that the embrace of crank economics presaged the general moral collapse of the Republican establishment.

This collapse opened the door for paranoia and conspiracy theorists of all kinds

There is, I would argue, a direct line from the Laffer curve, to Jan. 6, to Buffalo.

A handful of financial institutions produced them when Rio de Janeiro hosted in 2016, using a mixture of macroeconomic indicators and performances at previous Olympics to forecast total medal hauls for each country.

Gracenote’s distinguishing feature is the ability to produce quantitative analysis for each event.

Gracenote still uses the old system to produce its public medal table, which also deals in absolute forecasts, rather than fractional ones. If a French athlete, say, is the most likely to win an event, France gets awarded one gold medal in the table, even though the true probability of the athlete winning gold is less than 100% and his chances of claiming silver and bronze are greater than 0%.

the Elo rating system, which was developed for chess by Arpad Elo, a Hungarian physicist. The formula exchanges ranking points from the loser to the winner, with greater rewards for beating stronger opponents. The difference in ratings points between two rivals can be easily used to calculate the probability that one will beat the other.

Yet only two events on the winter Olympics programme, curling and ice hockey, involve head-to-head contests.

Those that compete in teams have their scores blended with their compatriots. And for those that participate in a number of events, such as Ms Dahlmeier, results in related disciplines affect multiple ratings. A strong performance in the biathlon sprint, a group race, would boost her ranking in the pursuit, a staggered race, for example.

The best way to answer that question is to take every previous contest in the sport and analyse how past results correlate with future success.

The bans have benefited Norway most, as the country will likely gain of the five of the 12 foregone medals—enough to nudge it ahead of Germany into first place in terms of total medals won.

Mr Gleave notes that the favourite only wins about 30% of the time, a lower share than in any other winter sport. Ms Dahlmeier’s rating has dwindled a little, but not by enough to suggest that last year’s record breaker has become this year’s flop.

Gracenote’s research into age curves for each sport shows that the best biathletes can maintain their peak performance into their early 30s (see chart). Expect to see more event-by-event forecasting at future Olympics, too.

this is the key part—people did not accept the reasonable expectations. They fought and organized and worked. They bent the curve of the future.

now is no time for celebration. To use a World War II analogy, we’ve survived Dunkirk, the Blitz and Pearl Harbor—but much damage has been done, the enemies of liberalism remain formidable, and we’ve only just begun the effort to regain ground. Even if victory is possible, there is a long and difficult road ahead.

Perhaps Churchill’s 1941 Christmas Eve address from the White House, where he was visiting Roosevelt, is apt.

“Let the children have their night of fun and laughter,” he remarked. And “Let us grown-ups share to the full in their unstinted pleasure.”But Churchill added that, after sharing that moment of pleasure, we will have to “turn again to the stern task and the formidable years that lie before us, resolved that, by our sacrifice and daring, these same children shall not be robbed of their inheritance or denied their right to live in a free and decent world.”