Well, the title says it all really.   I`ve just watched BBC4`s excellent two-part series presented by Professor Jim Al-Khalili which explored the properties of light and dark matter and the implications of discovering that the light we see throughout the universe is only 4% of the `stuff` that`s out there.

Now I like Jim - he`s quite probably the best communicator of science on television and is the kind of guy you can take seriously when he explains things - it`s all about the subject with Jim and not about Jim himself, which makes a healthy change from some, perhaps more high profile, `presenters.`   And BBC4 just gets better and better, providing an impressive output of interesting, sometimes quirky, but always compelling documentaries. Now, my views on the profligacy of the BBC are well documented but I readily admit that BBC4 is worth the licence fee all by itself.

So I got interested in Jim and I discovered that quite apart from his brilliant career there is another side to him.   You see, it turns out that he lives in Southsea, which is a bit of Portsmouth really and that he supports Leeds United.   Just shows that in everyone`s life there is always a bit of dark as well as the light we see.