Egyptian Goose

The male Egyptian goose (Alopochen aegyptiacus) enjoying the spring sunshine beside the large lake in Reading University grounds.  It's mate is thought to be on the island, sitting on eggs.  In previous years the male has been rather aggressive towards other geese while it's mate was sitting, but this year it seems much more laid back.

Photo taken by my daughter Zoe on 2009-03-21.

Lions in Europe

From Wikipedia:

In relatively recent times the habitat of lions spanned the southern parts of Eurasia, ranging from Greece to India, and most of Africa except the central rainforest-zone and the Sahara desert. Herodotus reported that lions had been common in Greece around 480 BC; they attacked the baggage camels of the Persian king Xerxes on his march through the country. Aristotle considered them rare by 300 BC and by 100 AD extirpated. A population of the Asiatic Lion survived until the tenth century in the Caucasus, their last European outpost.

Via Gene Expression.

Evaporative Cooling of Group Beliefs

Here is an interesting piece from 2007 in which Eliezer Yudkowsky draws an analogy between the rise of fanaticism in cults and the physical process of evaporative cooling.  Be sure to have a play with the Java applet at the foot of this page.

Mistakes as Spurs to Research

Here are a couple of examples in which young researchers submitted papers for publication which contained potentially embarrassing mistakes.  But, rather than being put off by their mistakes and retiring into obscurity to to lick their wounds, both researchers were spurred into doing the work which made them famous.

From this biography of the mathematician Neils Henrik Abel:

While in his final year at school, however, Abel had begun working on the solution of quintic equations by radicals. He believed that he had solved the quintic in 1821 and submitted a paper to the Danish mathematician Ferdinand Degen, for publication by the Royal Society of Copenhagen.  Degen asked Abel to give a numerical example of his method and, while trying to provide an example, Abel discovered the mistake in his paper.

Abel went on to prove that there is no general solution in radicals to quintic equations (the Abel-Ruffini theorem). In his book Finding Moonshine, Marcus du Sautoy suggests that Degen actually recognised that Abel's solution was flawed and, by asking for a numerical example, he was gently prompting Abel to look at his work again, without discouraging him.

The second example is from here on the web-site of the computer scientist Leslie Lamport:

When I first learned about the mutual exclusion problem, it seemed easy and the published algorithms seemed needlessly complicated.  So, I dashed off a simple algorithm and submitted it to CACM. I soon received a referee's report pointing out the error.  This had two effects. First, it made me mad enough at myself to sit down and come up with a real solution.  The result was the bakery algorithm described in.  The second effect was to arouse my interest in verifying concurrent algorithms.

Lamport's bakery algorithm was just the first of many important contributions he made in the field of concurrent algorithms.

Bud

A bud on an as yet unidentified shrub.  (Identifiying plants can be rather difficult before their leaves come out.)   Photo taken beside the middle lake, Reading University grounds, Reading, UK, on 2009-03-15.