Here's my report on new research that suggests young people who smoke cannabis run the risk of a significant and irreversible reduction in their IQ. The findings come from a study of about 1,000 people in New Zealand.
Although cannabis is widely used in the UK, possession can lead to up to five years in jail. The research has been seized on by both sides of the debate over whether to legalise cannabis.
In the sultry Athenian air, this feels like a place holding its breath.
Greeks have always scrawled on walls. But after sunset this troubled summer, masked graffiti agitators have roamed the capital's streets applying their urgent exhortations to every flat surface they can find.
The empty seats scandal at these Olympics refuses to go away. The problem is not simply that each vacant place is a kick in the teeth to the millions of sports fans who have tried desperately to get hold of tickets.
The blocks of empty seating are also a reminder of the privileges available for the rich and powerful at these Games. It looks dreadful because each unused spot emphasises the special treatment afforded to officials and their business partners who then don't turn up.
New figures reveal that the NHS in England spent more than £270m on antidepressants last year - a massive 23% increase on 2010. The health service spent almost £1m a week more on the drugs than the year before.
Antidepressant use has been growing rapidly for decades. In 1991, English pharmacies handed over nine million items. In 2001, it was 24.3 million. Now the number has grown to 46.7 million prescriptions issued - a 9.1% rise on the previous year.
Only rarely do countries get the opportunity to describe themselves to a watching world. Today's Olympic opening ceremony is a defining moment for this country - literally.
But trying to pin down national identity is always a difficult and dangerous occupation - even more so if your chosen medium involves marshalling 1,000 people, nine geese and 70 sheep on a sports field.
As much of Britain basks in longed-for sunshine one senses that, despite all the economic gloom, our national spirits have been lifted. We instinctively believe that warm weather makes us happier. But is it true?
Yesterday's well-being statistics suggested the opposite. The happiest region of the whole UK is the most northerly - Shetland, Orkney and the Outer Hebrides. Some islands see only around 1,000 hours of sunshine a year compared to a UK average of 1,340 hours.
There is a risk of jumping to conclusions with today's well-being figures. We know that people in rented accommodation report significantly lower levels of life satisfaction than home-owners. But that doesn't mean renting is bad for your happiness.
All we can say is that there may be something about the kind of people who rent their homes that makes it more likely they will have lower levels of well-being. Home-owners are generally financially better off than people who rent and they are more likely to be in a stable relationship - both factors that are also associated with higher levels of life satisfaction.
I need more time to digest the new statistics on national well-being, but one finding got me sitting bolt upright in my chair today.
Among the four questions asked as part of the survey is "Overall, how anxious did you feel yesterday?" Respondents must pick a score between 0 and 10 with any score below three being regarded as indicative of a pretty chilled-out individual.
We learn today that there are almost half a million more people living in England and Wales than official estimates had suggested. We are pretty good at counting babies and corpses, so we must have been under-counting net migration during the past decade.
It is not a wild underestimate - less than 1% of the total population. But the 480,000 individuals of whom the authorities were unaware will fuel arguments about immigration and how we best deal with an ageing population.
Sometimes you ask one question and discover a surprising answer to another. I wondered how many of England's youth clubs had closed down after council cuts. But what became clear as I researched the issue was how, all over the country, volunteers and communities were managing to keep services open.
You can try it yourself. Do a simple internet search on "youth club closures" and read the local online newspaper stories.
It is boom time for the mobility scooter industry.
The new millennium dawned to the electrical hum of around 70,000 powered wheelchair and scooter users in Britain. Today there are five times as many, with warnings of "mo-sco" gridlock in some of our more populous retirement villages.
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