An interesting little piece here.
It's amazing how often coincidence and correlation are confused which is bad enough in itself, but then correlation is further confused with causation we get wrong headed thinking like the "mobile phones killing bees" stories we were reading a while back.
An interesting point to ponder in light of this is the birthday "paradox". If you have 30 people in a room, what is the probability that two of them will have the same birthday?
Is it 10%?
20%?
No, it's 70%. Why - because although there are only 30 people, there are 30 possible birthdays they could share - so it is like saying "Whose birthday is on 19th August" to a room with 29 people in it, and trying with 30 different dates - it ends up being quite likely that at least one person will say yes.
So what is the lesson in all of this? Our instincts are way off when it comes to working out what is likely when it comes to coincidences in the complex world we live in. Statements like "That can't just be a coincidence!" are often just plain wrong. Either sit down and do the maths or take the advice of someone who has.
jk