If scientists wrote horoscopes, this is what yours would say

Martha Gill's Irrational Animals column.

A new year, a new set of horoscopes, a renewed chorus from naysayers who fail to see the link between when they were born and what will happen to them next Tuesday. But science says they’re just not looking hard enough. Tiny seasonal variations at your time of birth can affect both your health and your character. Finally - here’s a horoscope based on real medical evidence.

Aries: 21 March – 19 April
You’ve never been that bright, Aries, and medics at Indiana University put this down to a heightened use of pesticides around the time of your birth. You also sometimes feel that you’re sleepwalking through life. Give in to the feeling - it’s just narcolepsy (more likely in those born in March or April).

Taurus: 20 April – 20 May
Oh, Taurus, sometimes you’re on top of the world, other times you just can’t get out of bed. Your friends are confused: what’s going on? Tell them that babies born in May are happier – they first experienced the world in summer. They are also more likely to suffer from seasonal affective disorder; depression hits in the darker months.

Gemini: 21 May – 21 June
Children born at this time are often better behaved and less likely to play truant. Maybe it’s time to let loose a bit, Gemini.

Cancer: 22 June – 22 July
Cancerians, you usually think yourselves lucky – due to low rates of postnatal depression in mothers of summer babies. Your instincts are off, however: you’re at a slightly higher risk of Hodgkin’s lymphoma, according to Danish research from 2003.

Leo: 23 July – 22 August
Your friends tell you you’re just not the maternal type. They’re right: Austrian research finds that those born now grow up to have the fewest children.

Virgo: 23 August – 22 September
You keep telling people you’re big-boned but they don’t believe you. It’s true, though – your mother got more sunlight as her pregnancy progressed and the Vitamin D gave you thick, strong bones. See?

Libra: 23 September – 22 October
Librans, you have the best chance of becoming a professional footballer. You’ll be one of the biggest children in the school year and get picked for the best team early on. Things will progress from there. Hurray for Jupiter in the ascendant or whatever.

Scorpio: 23 October – 21 November
This year is as good a time as any to take up yoga, because you’ll be feeling flexible and energetic, partly because of your low risk of arthritis and multiple sclerosis (as your mother got plenty of sunlight late in her pregnancy).

Sagittarius: 22 November – 21 December
Sagittarians like to live life at the sharp end – December babies are the most likely to become dentists. But take off those plastic gloves and have a rest in the chair: cold temperatures at birth increased your risk of eczema and heart disease.

Capricorn: 22 December – 19 January
Capricornians, you are clever, tall and successful – your mother was pregnant in the summer and ate lots of fruit and vegetables. If you have one flaw, it’s that irritating tendency to have epilepsy, caused by prenatal winter infections.

Aquarius: 20 January – 18 February
This year, you’ll be as clearsighted as ever; low levels of daylight at birth gave you better long-distance vision. Older Aquarians may be feeling under the weather, though – an early lack of Vitamin D has been linked to depression later in life.

Pisces: 19 February – 20 March
Assertive, successful, bossy: there are more CEOs born now than at any other time of the year. Male Pisceans beware: you’re at a marginally higher risk of autism.

The science of horoscopes. Photograph: Getty Images

Martha Gill writes the weekly Irrational Animals column. You can follow her on Twitter here: @Martha_Gill.

This article first appeared in the 14 January 2013 issue of the New Statesman, Dinosaurs vs modernisers

#Match4Lara
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#Match4Lara: Lara has found her match, but the search for mixed-race donors isn't over

A UK blood cancer charity has seen an "unprecedented spike" in donors from mixed race and ethnic minority backgrounds since the campaign started. 

Lara Casalotti, the 24-year-old known round the world for her family's race to find her a stem cell donor, has found her match. As long as all goes ahead as planned, she will undergo a transplant in March.

Casalotti was diagnosed with acute myeloid leukaemia in December, and doctors predicted that she would need a stem cell transplant by April. As I wrote a few weeks ago, her Thai-Italian heritage was a stumbling block, both thanks to biology (successful donors tend to fit your racial profile), and the fact that mixed-race people only make up around 3 per cent of international stem cell registries. The number of non-mixed minorities is also relatively low. 

That's why Casalotti's family launched a high profile campaign in the US, Thailand, Italy and the US to encourage more people - especially those from mixed or minority backgrounds - to register. It worked: the family estimates that upwards of 20,000 people have signed up through the campaign in less than a month.

Anthony Nolan, the blood cancer charity, also reported an "unprecedented spike" of donors from black, Asian, ethcnic minority or mixed race backgrounds. At certain points in the campaign over half of those signing up were from these groups, the highest proportion ever seen by the charity. 

Interestingly, it's not particularly likely that the campaign found Casalotti her match. Patient confidentiality regulations protect the nationality and identity of the donor, but Emily Rosselli from Anthony Nolan tells me that most patients don't find their donors through individual campaigns: 

 It’s usually unlikely that an individual finds their own match through their own campaign purely because there are tens of thousands of tissue types out there and hundreds of people around the world joining donor registers every day (which currently stand at 26 million).

Though we can't know for sure, it's more likely that Casalotti's campaign will help scores of people from these backgrounds in future, as it has (and may continue to) increased donations from much-needed groups. To that end, the Match4Lara campaign is continuing: the family has said that drives and events over the next few weeks will go ahead. 

You can sign up to the registry in your country via the Match4Lara website here.

Barbara Speed is a technology and digital culture writer at the New Statesman and a staff writer at CityMetric.