But first...
Dulltown, UK: Today's lost plectrum is the one eventually spotted amongst the rocks on the surface of Mars by the Curiosity Rover.
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'So, you have recently left school - which of the subjects there did you find particularly interesting?'
'Oh, I think science, and religious studies.'
'Really?'
'Yes.'
'And why was that?'
'Well, they both started off being very strange, and really mysterious - and I'd always liked little puzzles and conundrums.'
'So, that's what first attracted your interest?'
'Of course, both subjects are really fascinating. You know, things that seemed peculiar, things that go against common sense, things that need a good explanation!'
'Such as?'
'Well, things like, why a straight pencil placed in a glass of water looks bent - and why if you make the sides of a cube twice as long it makes the cube eight times as heavy, and...'
'Eight times? That sounds rather unlikely!'
'Yes, it does, doesn't it?... And then there's gravity!'
'Gravity?'
'Yes, how all things are attracted to heavy objects.'
'But gravity is still fairly mysterious, isn't it?'
'Yes, it is, but, it is predictable and measurable, you know.'
'I suppose so... but you mentioned religious studies earlier.'
'Oh, yes, and that was packed full of puzzles and mysteries too!'
'Just like science...'
'Well, sort of, but...'
'But?'
'But, when you study science, things slowly become clear, and you start to get a picture of how the world, and the universe, works...'
'And religion?...'
'Well, when you asked questions...'
'I'll bet you asked a lot of those!'
'Yes, I did, and there were lots and lots of puzzling things which they didn't explain.'
'Things like?...'
'Well, heaven, hell, saints, eternal life, angels, miracles, prophets, creation, walking on water, devils, spirits, God... things like that.'
'Hm...'
'All these things that you couldn't see, but they desperately wanted you to believe in them, and all these things are mentioned in, the book.'
'The book?'
'Yes, there is always a book, a very old thick book, written a long long time ago.'
'Hasn't it ever been updated?'
'No, that's not allowed.'
'Why is that?'
'They would never say... You see, science is changing every day, and knowledge is growing, but with religions, they are all completely stuck with what they've got, and these days they really struggle to justify it all.'
'So, science...'
'Yes, I think science is definitely a better thing to study...'
'Do you think you could you explain that thing about the cube getting eight times heavier for me?'
'Yes, of course, let me draw you a simple diagram which will make it clear for you - could I borrow your pen, Archbishop?...'