This site uses cookies. By continuing to use this site you agree to our use of cookies. To find out more, see our Privacy and Cookies policy.
Skip to the content

Share this

Free weekly newswire

Sign up to receive all our latest news direct to your inbox.

Physics on film

100 Second Science Your scientific questions answered simply by specialists in less than 100 seconds.

Watch now

Bright Recruits

At all stages of your career – whether you're an undergraduate, graduate, researcher or industry professional – can help find the job for you.

Find your perfect job

Physics connect

Are you looking for a supplier? Physics Connect lists thousands of scientific companies, businesses, non-profit organizations, institutions and experts worldwide.

Start your search today


Father figure

Leonard Susskind: a Darwinian physicist

By Matin Durrani

He probably won’t like me for saying this, but Leonard Susskind of Stanford University looks a bit like Charles Darwin.

The reason I know is that Susskind – one of the father figures of string theory – flashed up a slide of the great man (Darwin that is) during a public lecture last night held as part of the University of Bristol’s centenary celebrations and the city’s Festival of Ideas.

It was uncanny: Susskind’s grey beard and thinning hair make him a dead ringer for Darwin, who was born 200 years ago this year. I wonder if anyone’s told him of the likeness before?

Attended by nearly 700 people packed into the university’s neo-gothic Wills Memorial Building, Susskind’s lecture was entitled “Darwin and the cosmic landscape”, in which he examined Darwin’s influence on physics.

Susskind’s thesis is that by putting forward the then radical idea of a natural explanation of the origins of life, Darwin “set the standard for what an explanation should be like”. In other words, as Susskind eloquently explained, by rejecting the idea that life was too improbable too have arrived by accident and that there must be some sort of grand designer, Darwin instead sought a scientific explanation for the existence of life.

As Susskind pointed out, there are four different base pairs on a DNA molecule (A, G, C and T) and with each molecule having typically 10^8^ base pairs, there must be 4 to the power 10^8^ different ways of arranging those base pairs. Genetic mutations allow different arrangements, which – eventually – leads to the “tree of life”.

But what’s all this got to do with physics? Well, string theory permits the existence of a “landscape” of about 10^500^ different universes. We live on one of these universes – the one that permits the existence of life. It’s essentially an anthropic argument – the world is fine-tuned so we’re here to observe it.

I won’t go into the details here, but you can find all you need to know about this subject in an article by former Physics World features editor Matthew Chalmers, who also rolled up at last night’s lecture and was one of several people to pop Susskind a question.

Susskind has also written about the landscape in his book The Cosmic Landscape: String Theory and the Illusion of Intelligent Design, which fellow string theorist Michael Duff reviewed for Physics World in 2005.

After the lecture, I joined Susskind for dinner at the Bordeaux Quay restaurant on Bristol’s harbourside.

He was great company and recalled, over a pudding of chocolate tart, how he never wanted to write The Cosmic Landscape, but was persuaded to do so by legendary New York agent John Brockman who reckoned Susskind had a talent for writing. Actually, Susskind said he found his more recent book The Black Hole War: My Battle with Stephen Hawking to Make the World Safe for Quantum Mechanics much harder to write than his first.

Susskind has a knack for a good story and told me a great anecdote about the time he met Bristol-born Nobel laureate Paul Dirac in the US in the late 1960s when, as a fresh-faced physicist, he asked Dirac’s advice on how to solve a particular physics problem. I can’t remember all the details – and anyway it would never be as amusing if I told it — but suffice to say it was all about Schrodinger’s equation. No, honestly, it was funny.

Based at Stanford, Susskind seems to know pretty much everyone who’s anyone in US west coast physics, including former Berkeley Lab boss Steven Chu. Like most physicists, Susskind reckons Barack Obama has made a great choice in picking Chu as his energy secretary. (“Chu’s a great guy, really sharp.”)

Susskind also had some choice comments about another Stanford colleague — the Nobel laureate Robert Laughlin, who was famously recruited to lead and reform the Korea Advanced Institute of Science and Technology, but left under a cloud after just two years in charge.

As we left the restaurant, I asked Susskind if he fancied writing anything for Physics World. He wrote a feature for us a couple of years back on superstrings and did a small piece for our 20th anniversary issue last year. So we’ll see if he has something new up his sleeve.

This entry was posted in General and tagged . Bookmark the permalink.
View all posts by this author  | View this author's profile


  1. JJEHerrera

    It looks like the “anthropic principle” will be an interesting subject for discussion for science philosophers in the years to come. I’m still not convinced whether it means an advancement or a back-step in the way we do science. There seem to be good arguments on both sides of the debate.

  2. Good arguments on both sides exist indeed. The question is how far we wish to advance towards basing our theories on even more fundamental principles. The anthropic principle applied on water for instance would lead us to claim prematurely that, since life and humans cannot exist without it, science needs go no further explaining why it can be found on our planet. With regards to “string theory” universes, are we certain there are no more fundamental principles explaining why our world seems to have chosen this very particular equilibrium? What if string theory has missed an important ingredient (like a non-flat potential or an additional symmetry) imposing the Universe as we observe it? Compactification manifolds used by string theory to determine the symmetry of our world, even though possibly correct, do not seem to be concepts fundamental enough in order for scientists to stop searching for possible additional or alternative ways to determine this remaining symmetry. Lots of work remains to be done in this direction, and scientists should be encouraged to pursue their efforts further. Imagine where science would be now if we had not discovered the constituents of water just because some insisted that the case was over…

Leave a comment

Your e-mail address will not be published. Required fields are marked *


  • Comments should be relevant to the article and not be used to promote your own work, products or services.
  • Please keep your comments brief (we recommend a maximum of 250 words).
  • We reserve the right to remove excessively long, inappropriate or offensive entries.

Show/hide formatting guidelines

Tag Description Example Output
<a> Hyperlink <a href="">google</a> google
<abbr> Abbreviation <abbr title="World Health Organisation" >WHO</abbr> WHO
<acronym> Acronym <acronym title="as soon as possible">ASAP</acronym> ASAP
<b> Bold <b>Some text</b> Some text
<blockquote> Quoted from another source <blockquote cite="">IOP</blockquote>
<cite> Cite <cite>Diagram 1</cite> Diagram 1
<del> Deleted text From this line<del datetime="2012-12-17"> this text was deleted</del> From this line this text was deleted
<em> Emphasized text In this line<em> this text was emphasised</em> In this line this text was emphasised
<i> Italic <i>Some text</i> Some text
<q> Quotation WWF goal is to build a future <q cite="">
where people live in harmony with nature and animals</q>
WWF goal is to build a future
where people live in harmony with nature and animals
<strike> Strike text <strike>Some text</strike> Some text
<strong> Stronger emphasis of text <strong>Some text</strong> Some text
WordPress Appliance - Powered by TurnKey Linux