Moving usually involves making surprising discoveries in cupboards and drawers. While packing last month, I unearthed an ABC book my older sister made for me, several high-school essays, as well as all the notes from my first year at university. Apart from the alphabet, which fortunately I still remember, I was astonished at how much information has vanished from my brain. Apparently, not so long ago, I could compare the philosophers of the Enlightenment, summarize the reasons for the Great Depression, and distinguish between the many types of Finnish bogs — all this is now utterly lost.

But with a second look, my feeling of depression faded. The main messages still seemed familiar. True, I didn't remember all the details, but the essentials from my years of schooling were there, ready to be awakened by a little prompting.

The bundles of paper reminded me about the importance of major ideas and scientific themes. Writing up my thesis means I must delve into the smallest details of social life in an ant colony. But thinking outside the box is often useful and inspiring. To find new approaches to old problems, I like to explore other fields through teaching or attending seminars. Simply associating with students in other disciplines and departments can help. So, for those lacking inspiration, don't just stare at the computer screen. Try a game of beach football with your peers.