It may involve illegal liquor, prostitution, tax-cheating unlicensed taxis, it may be petty shoplifting or worse, but it's on the Dirty Boulevards where young men like Kama, Mucina and Boniface hang out that real change is often happening.

BBC: Nairobi's motorbike boys improving their own slum

For those concerned about carbon emissions, that's half way to a good news story, as gas-burning is less dirty than coal, but it's still a long way short of good for the environment.

BBC: Energy bills, and loose change

But let's face it - admitting in public that you have some dirty washing to deal with is one thing.

BBC: Not standing still - devolution lessons