Global warming, the war on terror and rampant consumerism getting you down? Well, lighten up: here, 17 of the world's smartest scientists and academics share their reasons to be cheerful
Brian Eno, Artist; composer; producer (U2, Talking Heads, Paul Simon); recording artist
Things change for the better either because something went wrong or because something went right. Recently, we've seen an example of the former, and this failure fills me with optimism. ...
I am optimistic about humanity's coming enlightenment.
In particular, I am optimistic about humanity's prospects for starting exemplary new collaboratively developed knowledge resources. When we hit upon the correct models for collaborative knowledge-collection online, there will be a jaw-dropping, unprecedented, paradigm-shifting explosion in the availability of high-quality free knowledge.
Lord (Martin) Rees, President, The Royal Society; Professor of Cosmology & Astrophysics; Master, Trinity College, University of Cambridge; author, 'Our Final Century: The 50/50 Threat to Humanity's Survival'
The energy challenge
A few years ago, I wrote a short book entitled 'Our Final Century'. I guessed that, taking all risks into account, there was only a 50 per cent chance that civilisation would get through to 2100 without a disastrous setback. This seemed to me a far from cheerful conclusion. However, I was surprised by the way my colleagues reacted to the book: many thought a catastrophe was even more likely than I did, and regarded me as an optimist. I stand by this optimism....
Judith Rich Harris, Independent investigator and theoretician; author, 'No Two Alike: Human Nature and Human Individuality'
I am optimistic about human relationships - in particular, about friendship. Perhaps you have heard gloomy predictions about friendship: it's dying out, people no longer have friends they can confide in, loneliness is on the rise....
The full-length versions of these pieces (and many more) can be found at www.edge.org, a website founded by John Brockman.'What Is Your Dangerous Idea?', by John Brockman (Editor), is published by Simon & Schuster, £12.99; 'What We Believe But Cannot Prove', by John Brockman (Editor), is published by Pocket Books, £7.99