Saving the World, and Healing the Sick

February 12, 2015 § Leave a comment

When I applied to medical school, I had to write a personal statement: selling how exceptional my achievements were, what wonderful personal qualities I had, and my noble motivations for wanting to be a doctor. The last of these is the most embarrassing in retrospect:

I want to study medicine because of a desire I have to help others, and so the chance of spending a career doing something worthwhile I cannot resist. Of course, Doctors [sic] don’t have a monopoly on altruism, but I believe the attributes I have lend themselves best to medicine, as opposed to all the work I could do instead.

These “I like science and I want to help people” sentiments are common in budding doctors: when I recite this bit of my personal statement in a talk (generally as a self-flagellating opening gambit) I get a mix of laughs and groans of recognition – most wrote something similar. The impression I get from those who have to read this juvenalia is the “I like science and I want to help people” wannabe doctor is regarded akin to a child zooming around on their bike with stabilizers – an endearing work in progress. As they became seasoned in the blood sweat and tears of clinical practice, the vainglorious naivete will transform into a more grizzled, realistic, humane compassion. Less dying nobly, more living humbly; less JD, and more Perry Cox.

I still have a long way to go. « Read the rest of this entry »

How far can hard work take us?

January 24, 2015 § Leave a comment

There’s a perennial question about how much achievement something depends on talent, and how much on hard work. Perhaps genius (or even garden variety exceptional performance) is written into someone’s genes, or perhaps what separated Einstein from his peers had more to do with his work ethic than his IQ.

Evidence points in both directions. On the one hand, most high performers, whatever their field, emphasize how important hard work – rather than ‘just talent’ – is to their achievements (e.g. Terrence TaoWill Smith, Ira Glass, Thomas Edison). Some, like Malcolm Gladwell, talk about a ‘10000 hour rule‘ as the required hard work before one can truly excel. Perhaps the main proponent of the ‘Arbeit uber alles’ approach is Erikson’s work on deliberate practice. On the other hand, there are lots of instances where innate physical or mental characteristics play an important role: the average height of NBA players is 6’7″, Intelligence (albeit imperfectly measured by IQ) seems to predict lots of things (including various intellectual achievements) – and it appears to remain predictive even into the very high range.

So perhaps it is a mix. But the precise mechanism of the mix could be important; how do innate talents and amount of training relate to one another when it comes to achievement? Could some maths help?

A Growth-mindset model

Here’s one suggestion, implied by Uri Baum:

Performance = Talent + Practice intensity x Time practising[ref]Perhaps even better would be to use a time integral here, as likely practice intensity will vary over time. But multiplication is simpler, and simplicity is better than precision for toy models.[/ref]

On this sort of model, talent counts, but as time passes, practice matters more. Unlike talent – a static given – one can grow a stock of practice over time, and time invested in practice and hard work has a rich return on performance (c.f. Hamming’s remarks). An attractive corollary is that if one can improve one’s practice intensity, be that through more focused training, deliberate practice, better learning styles, etc. this acts as a multiplier – working smarter, as well as working harder may be a stronger determinant of success than talent.

If so, extraordinary talent may be a curse – it could let us coast. Bram suggests there might be a mechanism where if we select for exceptional achievement, we select for people with varying mixes of raw talent and hard work. The group which skew more towards the latter may overtake those skewing to the former former over time: those who skew towards more practice time and intensity will be able to grow faster, whilst those who mainly got to where they were ‘just’ on their talent may find they are hitting a wall unless they can improve how they develop. « Read the rest of this entry »

Why doctors don’t do much good

January 17, 2015 § Leave a comment

A talk I gave a little while ago at Imperial:


Here’s some other (fairly similar) presentations. Feel free to copy or adjust. If you want me to give a talk on this stuff, get in touch! « Read the rest of this entry »

How many lives does a doctor save?

January 17, 2015 § Leave a comment

[This is cross posted on 80,000 hours: 1 2 3. Particular credit to Ben Todd for basically writing the third section.]

Doctors have a pretty solid reputation as do-gooders. There are regular news stories about how advances in medical science promise to help more people than ever before. Many of us have had the experience of being ill, seeing our doctor, and being made better.

So it seemed a pretty good career move for a 17-year old wanting to make a difference. Like thousands of others, I applied to read medicine. This is what I wrote on my personal statement:

I want to study medicine because of a desire I have to help others, and so the chance of spending a career doing something worthwhile I can’t resist. Of course, Doctors don’t have a monopoly on altruism, but I believe the attributes I have lend themselves best to medicine, as opposed to all the other work I could do instead.

Was I right? Is medicine a good career choice for someone wanting to ‘make a difference’? « Read the rest of this entry »

Talks on Giving What We Can

January 17, 2015 § Leave a comment

I’m involved with Giving What We Can, a community that pledges to give 10% of their income to whatever best helps in the fight against global poverty. I’ve done a few talks on this over the years, here are the Prezi’s. Feel free to re-use them or their contents (most are permutations on similar points, although the tone and emphasis has varied depending on the audience – it is worth noting many of the figures are a bit out of date). If you want me to give a talk, get in touch! « Read the rest of this entry »

Why you shouldn’t believe the resurrection happened

January 16, 2015 § Leave a comment

The 12th (and final) part in “20 Atheist answers to questions they supposedly can’t.”

  1. What accounts for the empty tomb, resurrection appearances and growth of the church?

Short answer: We shouldn’t be that confident of these facts, but in any case the base rate fallacy and selection bias nixes the confirmatory power.

Longer answer: The argument implied in the question is that the historical record of Jesus provides strong evidence to believe he actually died and rose again, which provides evidence that Christianity’s central claims (e.g. God exists, Jesus is the son of god) are true. The question neatly summarizes the three main ‘planks’ of evidence usually offered:

  1. The Empty Tomb. When Jesus died, his body was placed in a tomb. Not only was a stone rolled in front of it, but also the authorities posted sentries outside the tomb to stop anyone stealing the body. Despite this, the stone was discovered to be rolled away, and the body had gone. (e.g. Mark 16:4, Luke 24:2-3)
  2. Resurrection appearances. Several different groups of people (the disciples, some women, etc.) are reported to have seen Jesus after he died. (e.g. Luke 24:15-31, 36-48; Matthew 28:9-10)
  3. The growth of the church. After Jesus died, his apostles (and figures like Paul) were committed to the message of Jesus, and helped the church spread rapidly. (cf. Acts, but also the historical record re. the Holy Roman empire, etc.)

The idea is this data is very hard to explain via purely atheistic means. Maybe Jesus didn’t really die, but is it plausible he could have got up and escaped the guarded tomb after being crucified and speared for good measure? Maybe the disciples managed to steal the body, but how did they manage to get that past the guards? (And what was in it for them? Why would many of them go on to die for a belief they knew to be false?) Maybe the appearances of the resurrection were just hallucinations, but how could there have been so many hallucinations, of so many different people, and why didn’t the authorities just squash the story by presenting the public with Jesus’s corpse?

So, it’s argued, the best explanation for the historical data is the Christian one: Jesus rose from the dead and left the tomb miraculously, and then appeared to people like the apostles and women who visited the tomb, and these people, convinced by the truth, to go on and grow the church. « Read the rest of this entry »

What does medical ethics have to do with medicine?

January 16, 2015 § Leave a comment

[From 2010!]

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