Regular readers of War in Context might be perplexed about some of the items that have been popping up here lately — particularly those that appear under my generic and cryptic byline: Attention to the Unseen.

Here’s another one — but this isn’t just another seemingly “off-topic” post. It also illustrates one of the reasons I am picking out such items.

In Intelligent Life, Ian Leslie writes: One day in 1945, a man named Percy Spencer was touring one of the laboratories he managed at Raytheon in Waltham, Massachusetts, a supplier of radar technology to the Allied forces. He was standing by a magnetron, a vacuum tube which generates microwaves, to boost the sensitivity of radar, when he felt a strange sensation. Checking his pocket, he found his candy bar had melted. Surprised and intrigued, he sent for a bag of popcorn, and held it up to the magnetron. The popcorn popped. Within a year, Raytheon made a patent application for a microwave oven.

The history of scientific discovery is peppered with breakthroughs that came about by accident. The most momentous was Alexander Fleming’s discovery of penicillin in 1928, prompted when he noticed how a mould that floated into his Petri dish killed off the surrounding bacteria. Spencer and Fleming didn’t just get lucky. Spencer had the nous and the knowledge to turn his observation into innovation; only an expert on bacteria would have been ready to see the significance of Fleming’s stray spore. As Louis Pasteur wrote, “In the field of observation, chance favours only the prepared mind.”

The word that best describes this subtle blend of chance and agency is “serendipity”. It was coined by Horace Walpole, man of letters and aristocratic dilettante. Writing to a friend in 1754, Walpole explained an unexpected discovery he had just made by reference to a Persian fairy tale, “The Three Princes of Serendip”. The princes, he told his correspondent, were “always making discoveries, by accidents and sagacity, of things which they were not in quest of…now do you understand Serendipity?” These days, we tend to associate serendipity with luck, and we neglect the sagacity. But some conditions are more conducive to accidental discovery than others.

Today’s world wide web has developed to organise, and make sense of, the exponential increase in information made available to everyone by the digital revolution, and it is amazingly good at doing so. If you are searching for something, you can find it online, and quickly. But a side-effect of this awesome efficiency may be a shrinking, rather than an expansion, of our horizons, because we are less likely to come across things we are not in quest of.

To some extent, War in Context reflects this web-wide narrowing of attention in its focus on Middle East politics. But now, in my own attempt to buck this wider trend and also reflect the fact that my own interests are not limited to the enduring political reverberations of 9/11, I am using “attention to the unseen” as an amorphous theme where I will call attention to gleanings from the web covering topics as diverse as endangered cultures and neuroscience, or the social organization of bees and avant-garde accordion music.