I've mentioned elsewhere that over the past two years, after (temporarily?) leaving the classroom I've travelled to more places than in previous years combined. This is seen by my wife as a glamorous activity – and it is, to an extent. I greatly enjoy meeting new people and places, as well as the time I get to reflect and ponder.

But travelling by one's self can be a rather lonely experience. Part of the price you pay for new experience is being constantly in unfamiliar situations. Like a smooth pebble found on a beach, everyday habits and routines help wear the edges off to make life easier. In contrast, travelling can provide you with sharp, vivid situations that stick in the memory for a long time – but this demands constant attention. Consequently, when travelling I'm tired not just from time zone differences, but in the difference in the amount of attention I have to pay to unfamiliar surroundings.

As I write this I'm in London Heathrow airport, having flown down from Newcastle. My wife and children waved me off; I'll see them again next Monday. My destination is San Francisco where I'm doing three things:

1. Attending the DML Conference (#dml2012)
2. Helping judge the DML Badges competition (#dmlbadges)
3. Doing an Ignite talk on Purpos/ed (http://purposed.org.uk)

I'll keep you updated day by day with what I'm up to.