I was on a journey to Bristol to pick up my daughter from Uni today. To make a change I decided I'd pick up some Earth caches on the way. This was the fifth and it actually turned out to be the last, as I received a text from her just as I arrived.
What an interesting little display. I wish there were things like this around when I was young.
I took some time working out the answers to all of the questions. I've sent the email off for marking -hopefully most were right.